#include <stdio.h>

int main() {
    int x,y,z;
    scanf("%d %d %d",&x,&y,&z);
    
    if(x%2==0){
        if(y%2==0) printf("%d",z);
        else if(z%2==0) printf("%d",y);
        else printf("%d",x);
    }
    else{
        if(y%2==1) printf("%d",z);
        else if(z%2==1) printf("%d",y);
        else printf("%d",x);
    }
    
    
    return 0;
}