#include<cstdio>
using namespace std;
#define ll long long
int a,n;
ll x,y;

void euclid(int a,int b,ll &x,ll &y)
{
    if(b==0)
    {
        x=1;
        y=0;
    }else
    {
        ll x0,y0;
        euclid(b,a%b,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d",&a,&n);
    euclid(a,n,x,y);
    //while(x<0) x+=n;
    printf("%d\n",x);
    fclose(stdin);
    fclose(stdout);
    return 0;
}