#include<stdio.h>
int main()
{
    int x,y,z;
    scanf("%d%d%d", &x,&y,&z);
    int a=(x%2);
    int b=(y%2);
    int c=(z%2);

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


    return 0;
}