Unity Engine Keycode Integer relation.

namespace UnityEngine
{
    public enum KeyCode
    {
        None = 0,
        Backspace = 8,
        Tab = 9,
        Clear = 12,
        Return = 13,
        Pause = 19,
        Escape = 27,
        Space = 32,
        Exclaim = 33,
        DoubleQuote = 34,
        Hash = 35,
        Dollar = 36,
        Ampersand = 38,
        Quote = 39,
        LeftParen = 40,
        RightParen = 41,
        Asterisk = 42,
        Plus = 43,
        Comma = 44,
        Minus = 45,
        Period = 46,
        Slash = 47,
        Alpha0 = 48,
        Alpha1 = 49,
        Alpha2 = 50,
        Alpha3 = 51,
        Alpha4 = 52,
        Alpha5 = 53,
        Alpha6 = 54,
        Alpha7 = 55,
        Alpha8 = 56,
        Alpha9 = 57,
        Colon = 58,
        Semicolon = 59,
        Less = 60,
        Equals = 61,
        Greater = 62,
        Question = 63,
        At = 64,
        LeftBracket = 91,
        Backslash = 92,
        RightBracket = 93,
        Caret = 94,
        Underscore = 95,
        BackQuote = 96,
        A = 97,
        B = 98,
        C = 99,
        D = 100,
        E = 101,
        F = 102,
        G = 103,
        H = 104,
        I = 105,
        J = 106,
        K = 107,
        L = 108,
        M = 109,
        N = 110,
        O = 111,
        P = 112,
        Q = 113,
        R = 114,
        S = 115,
        T = 116,
        U = 117,
        V = 118,
        W = 119,
        X = 120,
        Y = 121,
        Z = 122,
        Delete = 127,
        Keypad0 = 256,
        Keypad1 = 257,
        Keypad2 = 258,
        Keypad3 = 259,
        Keypad4 = 260,
        Keypad5 = 261,
        Keypad6 = 262,
        Keypad7 = 263,
        Keypad8 = 264,
        Keypad9 = 265,
        KeypadPeriod = 266,
        KeypadDivide = 267,
        KeypadMultiply = 268,
        KeypadMinus = 269,
        KeypadPlus = 270,
        KeypadEnter = 271,
        KeypadEquals = 272,
        UpArrow = 273,
        DownArrow = 274,
        RightArrow = 275,
        LeftArrow = 276,
        Insert = 277,
        Home = 278,
        End = 279,
        PageUp = 280,
        PageDown = 281,
        F1 = 282,
        F2 = 283,
        F3 = 284,
        F4 = 285,
        F5 = 286,
        F6 = 287,
        F7 = 288,
        F8 = 289,
        F9 = 290,
        F10 = 291,
        F11 = 292,
        F12 = 293,
        F13 = 294,
        F14 = 295,
        F15 = 296,
        Numlock = 300,
        CapsLock = 301,
        ScrollLock = 302,
        RightShift = 303,
        LeftShift = 304,
        RightControl = 305,
        LeftControl = 306,
        RightAlt = 307,
        LeftAlt = 308,
        RightApple = 309,
        RightCommand = 309,
        LeftApple = 310,
        LeftCommand = 310,
        LeftWindows = 311,
        RightWindows = 312,
        AltGr = 313,
        Help = 315,
        Print = 316,
        SysReq = 317,
        Break = 318,
        Menu = 319,
        Mouse0 = 323,
        Mouse1 = 324,
        Mouse2 = 325,
        Mouse3 = 326,
        Mouse4 = 327,
        Mouse5 = 328,
        Mouse6 = 329,
        JoystickButton0 = 330,
        JoystickButton1 = 331,
        JoystickButton2 = 332,
        JoystickButton3 = 333,
        JoystickButton4 = 334,
        JoystickButton5 = 335,
        JoystickButton6 = 336,
        JoystickButton7 = 337,
        JoystickButton8 = 338,
        JoystickButton9 = 339,
        JoystickButton10 = 340,
        JoystickButton11 = 341,
        JoystickButton12 = 342,
        JoystickButton13 = 343,
        JoystickButton14 = 344,
        JoystickButton15 = 345,
        JoystickButton16 = 346,
        JoystickButton17 = 347,
        JoystickButton18 = 348,
        JoystickButton19 = 349,
        Joystick1Button0 = 350,
        Joystick1Button1 = 351,
        Joystick1Button2 = 352,
        Joystick1Button3 = 353,
        Joystick1Button4 = 354,
        Joystick1Button5 = 355,
        Joystick1Button6 = 356,
        Joystick1Button7 = 357,
        Joystick1Button8 = 358,
        Joystick1Button9 = 359,
        Joystick1Button10 = 360,
        Joystick1Button11 = 361,
        Joystick1Button12 = 362,
        Joystick1Button13 = 363,
        Joystick1Button14 = 364,
        Joystick1Button15 = 365,
        Joystick1Button16 = 366,
        Joystick1Button17 = 367,
        Joystick1Button18 = 368,
        Joystick1Button19 = 369,
        Joystick2Button0 = 370,
        Joystick2Button1 = 371,
        Joystick2Button2 = 372,
        Joystick2Button3 = 373,
        Joystick2Button4 = 374,
        Joystick2Button5 = 375,
        Joystick2Button6 = 376,
        Joystick2Button7 = 377,
        Joystick2Button8 = 378,
        Joystick2Button9 = 379,
        Joystick2Button10 = 380,
        Joystick2Button11 = 381,
        Joystick2Button12 = 382,
        Joystick2Button13 = 383,
        Joystick2Button14 = 384,
        Joystick2Button15 = 385,
        Joystick2Button16 = 386,
        Joystick2Button17 = 387,
        Joystick2Button18 = 388,
        Joystick2Button19 = 389,
        Joystick3Button0 = 390,
        Joystick3Button1 = 391,
        Joystick3Button2 = 392,
        Joystick3Button3 = 393,
        Joystick3Button4 = 394,
        Joystick3Button5 = 395,
        Joystick3Button6 = 396,
        Joystick3Button7 = 397,
        Joystick3Button8 = 398,
        Joystick3Button9 = 399,
        Joystick3Button10 = 400,
        Joystick3Button11 = 401,
        Joystick3Button12 = 402,
        Joystick3Button13 = 403,
        Joystick3Button14 = 404,
        Joystick3Button15 = 405,
        Joystick3Button16 = 406,
        Joystick3Button17 = 407,
        Joystick3Button18 = 408,
        Joystick3Button19 = 409,
        Joystick4Button0 = 410,
        Joystick4Button1 = 411,
        Joystick4Button2 = 412,
        Joystick4Button3 = 413,
        Joystick4Button4 = 414,
        Joystick4Button5 = 415,
        Joystick4Button6 = 416,
        Joystick4Button7 = 417,
        Joystick4Button8 = 418,
        Joystick4Button9 = 419,
        Joystick4Button10 = 420,
        Joystick4Button11 = 421,
        Joystick4Button12 = 422,
        Joystick4Button13 = 423,
        Joystick4Button14 = 424,
        Joystick4Button15 = 425,
        Joystick4Button16 = 426,
        Joystick4Button17 = 427,
        Joystick4Button18 = 428,
        Joystick4Button19 = 429,
    }
}