#include <fstream>

std::ifstream in ("inversmodular.in");
std::ofstream out ("inversmodular.out");
int x,y,a,n,d,t;

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

int main () {
    in>>a>>n;
    euclid (a,n);
    while (x<0) x+=n;
    out<<x<<"\n";
    return 0;
}