#include <cstdio>

using namespace std;

void euclid(int &x, int &y, int a, int b)
{
    if(b == 0)
    {
        x = 1;
        y = 0;
        return;
    }

    int x0,y0;

    euclid(x0,y0,b,a%b);

    x = y0;
    y = x0 - (a / b) * y0;
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);

    int a,n,x,y;

    scanf("%d %d", &a, &n);

    euclid(x,y,a,n);

    while(x < 0)
        x += n;

    printf("%d\n", x);

    return 0;
}