// 1. EUCLID EXTINS

#include <stdio.h>
#include <stdlib.h>

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

int main()
{
    FILE *fin, *fout;
    fin = fopen("inversmodular.in", "r");
    fout = fopen("inversmodular.out", "w");
    int a, n;
    fscanf(fin, "%d%d", &a, &n);
    int x, y, d;
    euclid(a, n, &d, &x, &y);
    if (x <= 0) x = n + (x % n);
    fprintf(fout, "%d", x);
    return 0;
}