include <bits/stdc++.h>

using namespace std;

int main() { long long a,b,c; cin>>a>>b>>c; if (a+b==c || a+c==b ||b+c==a) cout<<"NO"; else cout<<fixed<<setprecision(2)<<a+b+c<<" "<<fixed<<setprecision(2)<<(double)(a*b)/2; return 0; }