#include<fstream>
using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
int A,N,x,y;
void asdf(int a,int b,int&x,int&y){
    if(!b) x=1,y=0;
    else{
        int x0,y0;
        asdf(b,a%b,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}
int main(){
    in>>A>>N;
    asdf(A,N,x,y);
    if(x<=0)x=x%N+N;
    out<<x;
    return 0;
}