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a guest Oct 22nd, 2019 57 Never
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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     int a,b,k,n;
  8.     cin >> a >> b;
  9.     k=1;
  10.     do {k+=1;} while ((a*b*k+1)!=(round(sqrt(a*b*k+1)))*(round(sqrt(a*b*k+1))));
  11.     n=sqrt(a*b*k+1);
  12.     if ((a<b) && (b-a)==2){cout << (b+a)/2;}
  13.     else {cout << n;};
  14.     return 0;
  15. }
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