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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. int n;
  6. long factorial = 1;
  7. cin >> n;
  8. for(int i = 1; i <= n; i++) {
  9. factorial *= i;
  10. }
  11. cout << factorial;
  12.  
  13. }
Success #stdin #stdout 0s 4284KB
stdin
20
stdout
2432902008176640000