#include <stdio.h>

using namespace std;

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

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

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