//Bai 10

#include<bits/stdc++.h>
using namespace std;
#define el "\n"
#define ll long long
#define ull unsigned long long
#define se second
#define fi first
#define be begin()
#define en end()
#define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
ll a, b, c;
void Run()
{
    cin >> a  >> b >> c;
    cout << (a + b + c) % 3;
}
int main()
{
    Faster;
    Run();
    return 0;
}