#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

using u128 = unsigned __int128;
using i128 = __int128;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    i64 x, y;
    std::cin >> x >> y;

    i64 ans = 0;
    int p = 0;
    while (x != 0) {
        x /= y;
        ans += (1LL << p);
        p++;
    }
    std::cout << ans << '\n';

    return 0;
}