#include <bits/stdc++.h> using namespace std; int main(){ int a, b, c, d; cin >> a >> b >> c >> d; int cnt0 = (a == 0) + (b == 0) + (c == 0) + (d == 0); int cnt1 = 4 - cnt0; if (cnt0 == 4 || cnt1 == 4) { cout << 0 << endl; } else if (cnt0 == 1 || cnt0 == 3) { cout << 1 << endl; } else { cout << 2 ; } return 0; } 求点赞