#include <iostream>

using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;

    int d = a + b + c;
    if(d % 3 == 0) {
        cout << 0 << endl;
    }
    else {
        if(d % 3 == 2) {
            cout << 1 << endl;
        }
        else {
            cout << 2 << endl;
        }
    }
    return 0;
}