#include <iostream>
using namespace std;
int lcm(int a, int b)
{
for (int i = 1; i <= b; i ++ )
if ((a * i) % b == 0)
return a * i;
return -1; //一定不会执行
}
int main()
{
int a, b;
cin >> a >> b;
cout << lcm(a, b) << endl;
return 0;
}
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