#include <stdio.h>

int main()
{
    int num1, num2, num3, num4, max;

    /* Input three numbers from user */
    printf("Enter first number: ");
    scanf("%d", &num1);

    printf("Enter second number: ");
    scanf("%d", &num2);

    printf("Enter third number: ");
    scanf("%d", &num3);

    printf("Enter fourth number: ");
    scanf("%d", &num4);


    if(num1 > num2)
    {
        if(num1 > num3)
        {
            max = num1;
        }
        else
        {
            max = num3;
        }
    }
    else if(num2>num4)
    {
        if(num2 > num3)
        {
            max = num2;
        }
        else
        {
            max = num3;
        }
    }
    else
    {
        if(num3 > num4)
        {
            max = num3;
        }
        else
        {
            max = num4;
        }
    }

    /* Print maximum value */
    printf("Maximum among all four numbers = %d", max);

    return 0;
}