#include<iostream> using namespace std; long fac(int n) { if(n==0 || n==1) return 1; else return n*fac(n-1); } int main() { int m,n; double sum; cin>>m>>n; sum=fac(m)/(fac(n)*fac(m-n)); cout<<sum<<endl; return 0; }
#include<iostream> using namespace std; long fac(int n) { if(n==0 || n==1) return 1; else return n*fac(n-1); } int main() { int m,n; double sum; cin>>m>>n; sum=fac(m)/(fac(n)*fac(m-n)); cout<<sum<<endl; return 0; }