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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     int fivB, thrB = 0;
  8.     int n;
  9.  
  10.     cin >> n;
  11.  
  12.     for(int i = n; i > 0;){
  13.         if(i < 3 || i == 4){
  14.             fivB = -1;
  15.             break;
  16.         }
  17.         else{
  18.             if(i%3 == 0 && i < 15){
  19.                 i -= 3;
  20.                 thrB++;
  21.             }
  22.             else{
  23.                 i -= 5;
  24.                 fivB++;
  25.             }
  26.         }
  27.     }
  28.  
  29.     cout << fivB + thrB;
  30.  
  31. }
  32.  
Success #stdin #stdout 0.01s 5308KB
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stdin
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7
stdout
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-1
https://ideone.com/rRbfmt
language:
C++14 (gcc 8.3)
created:
33 days ago
visibility:
public

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