#include<stdio.h>
int main(){
    int x,y,z;
    scanf("%d %d %d",&x,&y,&z);
    if((x%2)==(y%2)){
        printf("%d\n",z);
    }
    else if((x%2)==(z%2)){
        printf("%d\n",y);
    }
    else{
        printf("%d\n,x");
    }



}