#include <cstdio>

using namespace std;

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

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