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#include <bits/stdc++.h>
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using namespace std;
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int jiecheng(int n) {
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int result = 1;
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for (int i = 1; i <= n; ++i) {
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result *= i;
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}
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return result;
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}
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int main() {
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int n;
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cin >> n;
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int sum = 0;
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for (int i = 1; i <= n; ++i) {
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sum += jiecheng(i);
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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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