class Solution {
public long solution(int w, int h) {
long answer = (long)w*h - (w + h - gcd(w, h));
return answer;
}
public int gcd(int a, int b)
{
if(b>a){
int temp = a;
a = b;
b = temp;
}
int r = 0;
while(b!=0)
{
r = a%b;
a = b;
b = r;
}
return a;
}
}