F - Сумма факториалов

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c_cpp
2 years ago
224 B
16
Indexable
#include <iostream>

using namespace std;

int main() {
    int n;
    cin >> n;
    long long p = 1, sum = 1;
    for (int i = 1; i <= n; ++i) {
        p = p * i;
        sum += p;
    }
    cout << sum;
    return 0;
}


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