#include <stdio.h>

using namespace std;

FILE*f=fopen("inversmodular.in","r");
FILE*g=fopen("inversmodular.out","w");

void inv(int &x,int &y,int a,int b)
{
    if (b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        inv(x,y,b,a%b);
        int aux=x;
        x=y;
        y=aux-a/b*y;
    }
}

int main()
{
    int a,n,x,y;
    fscanf(f,"%d %d",&a,&n);
    inv(x,y,a,n);
    if (x<0) x=x+n;
    x=x%n;
    fprintf(g,"%d",x);
    fclose(f);
    fclose(g);
    return 0;
}