#include<stdio.h>
#include<math.h>
#include<string.h>
#include<stdlib.h>
#include<ctype.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(y%2==0&&z%2==0) printf("%d",y);
    else if(x%2==0 &&z%2==0) printf("%d",x);
    else if(x%2!=0&&y%2!=0)printf("%d",z);
    else if(y%2!=0&&z%2!=0) printf("%d",y);
    else if(x%2!=0 &&z%2!=0) printf("%d",x);

        return 0;
}