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  1. #include <bits/stdc++.h>
  2. #define ll long long int
  3. using namespace std;
  4. int div(int n){
  5.     int c=1,temp=7;
  6.     while(temp%n!=0){
  7.         temp=(temp%n)*10+7;
  8.         c++;
  9.     }
  10.     return c;
  11. }
  12. int main()
  13. {
  14.     int n;
  15.     cin>>n;
  16.     if(n%2==0 || n%5==0){
  17.         cout<<-1;
  18.         return 0;
  19.     }
  20.     cout<<div(n);
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 4276KB
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https://ideone.com/UlQKP4
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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