#include <stdio.h>

void InvMod(int a, int b, int &x, int &y){

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

int main(){

    int inv = 0, ins, A, N;

    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);

    scanf("%d %d", &A, &N);
    InvMod(A, N, inv, ins);

    if(inv <= 0) inv = N + inv % N;

    printf("%d\n", inv);

    return 0;
}