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