#include <cstdio>
using namespace std;

void invers_modular(long long a,long long b,long long &x,long long &y)
{
    if(!b)
    {
        x=1;y=0;
    }
    else
    {
        long long x0,y0;
        invers_modular(b,a%b,x0,y0);
        x=y0;
        y = x0 - (a / b) * y0;
    }
}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    long long a,n,x,y;
    scanf("%lld%lld",&a,&n);
    invers_modular(a,n,x,y);
    if(x<=0) x+=n;
    printf("%lld\n",x);
    return 0;
}