#include<cstdio>
FILE *fin, *fout;

long long a,n;
long long x,y;

void gcd(long long a, long long b)  {
    long long aux;
    if (!b)
    {
        x=1;
        y=0;
    }
    else
    {
        gcd(b,a%b);
        aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}

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