#include <bits/stdc++.h>
using namespace std;
int a,n;

void solve(int64_t &x, int64_t &y, int a, int b){
    if(!b)
        x=1, y=0;
    else{
        solve(x,y,b,a%b);
        int64_t aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}

int main() {
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    int64_t inv=0,ins;
    scanf("%d%d",&a,&n);
    solve(inv,ins,a,n);
    if(inv<=0)
        inv = n + inv % n;
    printf("%lld",inv);
    return 0;
}