#include <cstdio>

using namespace std;

int a,n;

void inversmodular(int a, int b, long long &x, long long &y)
{
    if (b == 0)
    {
        x = 1;
        y = 0;
        return;
    }
    inversmodular(b,a%b,x,y);
    int aux = x;
    x = y;
    y = aux - y * (a/b);
}
int main()
{
    long long x=0,y=0;
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d",&a,&n);

    inversmodular(a,n,x,y);
    if (x > 0) printf("%lld\n",x);
        else
        {
            x = n + x % n;
            printf("%lld\n",x);
        }
    return 0;
}