Выпоните умножение и результат переведите в десятичную систему счисления ​

#include <iostream>

typedef long long   ll;

using namespace std;

bool ll_is_valid(ll t, ll N, ll x, ll y)

{

return  t / x + (t - x) / y >= N;

}

ll f(ll N, ll x, ll y)

{

   ll R = 1;

   while (!ll_is_valid(R,N,x,y)) R *= 2;

ll L = R / 2;

while(R - L > 1)

{

 ll M   =   (L + R) / 2;

 

 if (!ll_is_valid(M,N,x,y)) {L = M;}

 else {R = M;}

}

return  R;

}

int  main()

{

ll N,x,y;

cin >> N >> x >> y;

if(x > y) swap( x, y );  

cout << f(N, x, y) <<  std::endl;

}

// PascalABC.NET 3.0, сборка 1156 от 30.01.2016
begin
  var s:=ReadlnString('Вводите:');
  s:=s.Replace('AND','OR');
  s:=s.Replace('And','Or');
  s:=s.Replace('and','or');
  Writeln;
  Writeln(s)
end.

Тестовое решение:
Вводите: And for the Birds? Mowgli let out a kite’s whistle. And now for the Snake People. The answer was a perfect hiss. Mowgli clapped his hands happily and jumped on Bagheera’s back.

Or for the Birds? Mowgli let out a kite’s whistle. Or now for the Snake People. The answer was a perfect hiss. Mowgli clapped his hors happily or jumped on Bagheera’s back.