#include<iostream.h>#include<math.h>#include<iomanip.h>void main(){int n,i;float p1,p2,s;cout<<"n=";cin>>n;
s=0;p1=1;p2=1;
for(i=1;i<=n;i++){p1*=i;p2*=(i+1); s+=p1*1./p2; }cout<<"s="<<s<<endl;}