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#include <bits/stdc++.h> using namespace std; typedef long long ll; int main() { ios_base::sync_with_stdio(false); int n, m; cin >> m >> n; int smrk = 0; int ret = 0; for(int i = 1; i <= n; i++) { smrk++; if(smrk == 4) { smrk = 1; } if(i > m) { ret += smrk; } } cout << ret << endl; return 0; }
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