#include <stdio.h>

using namespace std;

void euclid(int a, int b, int &d, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        d=a;
        return;
    }
    int xx,yy;
    euclid(b,a%b,d,xx,yy);
    x=yy;
    y=xx-a/b*yy;
}

int main()
{
    FILE *in,*out;
    in=fopen("inversmodular.in","r");
    out=fopen("inversmodular.out","w");

    int a,n,d,x,y;
    fscanf(in,"%d%d",&a,&n);

    euclid(a,n,d,x,y);

    if(x%n>0) fprintf(out,"%d",x%n);
    else fprintf(out,"%d",n+x%n);

    return 0;
}