绝对暴力63分= =

#include<iostream>
#include<cstdio>
using namespace std;
long long a,b;
int x,c,m,n;
int main()
{
    freopen("1217.in","r",stdin);
    freopen("1217.out","w",stdout);
    cin>>a>>b;
    //if(a<b){cout<<0;return 0;}
    a=a%b;
    for(int i=1;i<a+b;++i)
    {
        if(a*i%b==1)
        {
            x=i;
            break;
        }
    }
    cout<<x;
    return 0;
}