Main

start:  IN
    DUP

    BIPUSH 0x2B             // Checking whether it is a symbol or a number
    IF_ICMPEQ goto          // If symbol, do the according operation
    DUP                     // If number, go on

    BIPUSH 0x2D
    IF_ICMPEQ goto3
    DUP

    BIPUSH 0x2A
    IF_ICMPEQ goto4
    DUP

    BIPUSH 0x3D
    IF_ICMPEQ goto2
    BIPUSH 0x30             // Converting number to a lower level for a precise calculations
    ISUB
    GOTO start