#include <stdio.h>

int main()
{
	int x,y,z;
	scanf("%d %d %d", &x, &y, &z);

	if(x%2 == 0 && y %2 ==0)
    {
        printf("%d",z);
    }
    else if(x%2 == 0 && z%2 == 0)
    {
        printf("%d",y);
    }
    else if(z%2 == 0 && y%2 == 0)
    {
        printf("%d",x);
    }
    else if(x%2 != 0 && y %2 != 0)
    {
        printf("%d",z);
    }
    else if(x%2 != 0 && z%2 != 0)
    {
        printf("%d",y);
    }
    else if(z%2 != 0 && y%2 != 0)
    {
        printf("%d",x);
    }


	return 0;

}