Codeforces 478A - Initial Bet Solution

 Solution in C++: 

///******Bismillahir-Rahmanir-Rahim******///

///AH Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh 

1. #include<bits/stdc++.h>
2. using namespace std;
3. main()
4. {
5. int s=0,a[10],i;
6. for(i=0;i<5;i++)
7. {
8. cin>>a[i];
9. s+=a[i];
10. }
11. if((s!=0)&&(s%5==0))
12. cout<<s/5<<endl;
13. else
14. cout<<"-1"<<endl;
15. }