#include #include #include #include #include #include #include #include #include using namespace std; #define REP(i, j) for (int i = 0; i < (int)j; ++i) #define FOR(i, j, k) for (int i = (int)j; i < (int)k; ++i) #define SORT(v) sort(v.begin(), v.end()) #define REVERSE(v) reverse(v.begin(), v.end()) typedef complex P; typedef vector VI; typedef long long LL; typedef pair PII; int main() { cin.tie(0); ios::sync_with_stdio(false); LL n; int m; cin >> n >> m; cout << n / (1000 * m) * 1000 << endl; return 0; }