#include <stdio.h>

#define ll long long

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

ll computeModularInverse(ll A,ll M) {
    ll inv = 0, ins;

    recursiveGCD(inv, ins, A, M);

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

    return inv;
}

int main()
{
    ll A, M;

    FILE* stream;
    freopen_s(&stream, "inversmodular.in", "r", stdin);
    freopen_s(&stream, "inversmodular.out", "w", stdout);

    scanf_s("%lld %lld", &A, &M);
    
    ll modularInverse = computeModularInverse(A, M);

    printf("%lld\n", modularInverse);

    return 0;
}