#include <iostream>
using namespace std;
int factoial(int n){
int fact=1;
for(int i=1;i<=n;i++){
fact *=i;
}
return fact;
}
int nCr(int n,int r){
int fact_n=factoial(n);
int fact_r=factoial(r);
int fact_nmr=factoial(n-r);
return fact_n/(fact_r * fact_nmr);
}
int main() {
int n=9 ,r=5;
cout << nCr(n,r) << endl;
return 0;
}
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