//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;
}
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