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#include <bits/stdc++.h>
using namespace std;
int f(int n) {
int res = 1;
for (int i = 1; i <= n; i++) res *= i;
return res;
}
int main() {
int s = 0;
// 1!+2!+3!+4!+5!
for (int i = 1; i <= 5; i++) s += f(i);
cout << s << endl;
return 0;
}