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#include <bits/stdc++.h>
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using namespace std;
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long long factorial(int n) {
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if (n == 1) return 1;
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return n * factorial(n - 1);
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}
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int main() {
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long long s = 0;
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for (int i = 1; i <= 20; i++)
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s += factorial(i);
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cout << s << endl;
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return 0;
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} |
