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#include<iostream>
using namespace std;
int main(){
int a,b,c;
cin >> a;
b = a;
c=1;
while (b>0){
c = c*b;
b-=1;
}
cout << c;
}
#include<iostream>
using namespace std;
int main(){
int a,b,c;
cin >> a;
b = a;
c=1;
while (b>0){
c = c*b;
b-=1;
}
cout << c;
}