#include <bits/stdc++.h>

void gcd(long long &x, long long &y, int a, int b){
    if(!b) x = 1, y = 0;
    else{
        gcd(x, y, b, a % b);
        long long aux = x;
        x = y;
        y = aux - y * (a / b);
    }
}

int main(){
    FILE*fi,*fo;
    fi = fopen("inversmodular.in","r");
    fo = fopen("inversmodular.out","w");

    long long x, y;
    int a, n;
    fscanf(fi,"%d%d", &a, &n);
    gcd(x, y, a, n);
    if(x < 0) x = n + (x % n);
    fprintf(fo,"%lld", x);

    fclose(fi);
    fclose(fo);
    return 0;
}