20 lines
317 B
C++
20 lines
317 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n;
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int T;
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int sum = 0;
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cin >> n;
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for (int i = 1; i <= n; i++) {
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T = 1;
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for (int j = 1; j <= i; j++) {
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T *= j;
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}
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sum += T;
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}
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cout << sum << endl;
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return 0;
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}
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