#include <iostream>
using namespace std;

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

    int s = a + b + c;

    if(s % 3 == 0) {
        cout << 0 << endl;
    }
    else if((s + 1) % 3 == 0) {
        cout << 1 << endl;
    }
    else {
        cout << 2 << endl;
    }
    return 0;
}