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

}

#include <bits/stdc++.h> using namespace std; int main() { int a; long long s=1; cin>>a; for(int i=1;i<=a;i++) { s*=i; } cout<<s; return 0;

}

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#include <bits/stdc++.h> using namespace std; int main() { long long a,b=1; cin >> a; for(int i=1;i<=a; i++) { b=b*i; } cout << b << endl; return 0; }

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