#include<bits/stdc++.h> using namespace std; int main(){ int a,b,cnt1=0,cnt2=0; double e,f,c,d; cin>>a>>b; for(int i=1;i<=a;i++){ if(i%b==0){ c+=i; cnt1++; } else{ d+=i; cnt2++; }

}
e=c/cnt1;
f=d/cnt2;
printf("%.1f",e);
cout<<" ";
printf("%.1f",f);
return 0;

}