[Atcoder Grand Contest 004] Tutorial

Link:

AGC004 传送门

A:

……

#include <bits/stdc++.h>

using namespace std;
long long a,b,c;
int main()
{
    scanf("%lld%lld%lld",&a,&b,&c);
    if(a%2==0||b%2==0||c%2==0) puts("0");
    else printf("%lld",min(a*b,min(a*c,b*c)));
    return 0;
}

Problem A