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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4.     ios_base::sync_with_stdio(0);
  5.     cin.tie(0);
  6.     int i,j;
  7.     int totalweight;
  8.     cin>>totalweight;
  9.     int five,three,other = 0;
  10.     if(totalweight>=5){
  11.     	five = totalweight/5;
  12. 		other = totalweight%5;
  13.     }else{
  14.     	five = 0;
  15.     	other = totalweight;
  16.     }
  17.     if(other%3!=0){
  18.     	cout<<-1;
  19.     }
  20.     else{
  21.     	three = other/3;
  22.     	cout<<five+three;
  23.     }
  24.     return 0;
  25. }
Success #stdin #stdout 0s 5504KB
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https://ideone.com/O5o79S
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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