C++ :

#include <iostream>
#include <stdio.h>
using namespace std;
int a,b;
int main()
{
//	freopen("8a.in","r",stdin);
//	freopen("8a.out","w",stdout);
	cin >> a>>b;
	for (int N=100; ; N++)
	  if ( N%a==0 &&  N%b==3 )
	  {
		  cout <<N;
		  break;
	  }
	return 0;
}