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- #include <bits/stdc++.h>
- using namespace std;
- typedef vector<int> vi;
- int main() {
- int a1, a2, a3, a4; cin >> a1 >> a2 >> a3 >> a4;
- map<int,int> m;
- m[a1]++; m[a2]++; m[a3]++; m[a4]++;
- cout << 4 - max(m[0], m[5]);
- }
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