#include <fstream>

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

int main(){
    std::ifstream fin("inversmodular.in");
    std::ofstream fout("inversmodular.out");

    int a,n;
    fin>>a>>n;

    int x,y;
    euclid_extins(&x,&y,a,n);
    while(x<0) x+=n;

    fout<<x<<'\n';
}