#include <cstdio>
using namespace std;

int a,n;

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

int main() {
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d %d",&a,&n);
    int x,y;
    cmmdc(a,n,x,y);
    if (x < 0) x = n + x%n;
    printf("%d\n",x);
    return 0;
}