#include <cstdio>

using namespace std;

int n, a, b, c, l, k, d;

void euclidex(int a, int b, int &k, int &l, int &d)
{
    if(b==0)
    {
        l=1;
        k=0;
        d=a;
        return;
    }
    int k1, l1, d1;
    euclidex(b, a%b, k1, l1, d1);
    l=k1;
    k=l1-(a/b)*k1;
    d=d1;
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);

    scanf("%d %d", &a, &n);
    euclidex(a, n, k, l, d);
    if(l>0)
        printf("%d", l);
    else
    {
        while(l<0)
            l+=b;
        printf("%d", l);
    }
    return 0;
}