Cod sursă (job #764209)

#include <iostream>
using namespace std;

int main() {
    int C, T, M, X;
    cin >> C >> T >> M >> X;

    int days = 0;
    int mineralsCollected = 0;
    int numSCVs = 1;

    while (mineralsCollected < X) {
        days++;

        mineralsCollected += numSCVs * M;

        if (mineralsCollected >= X) {
            break;
        }

        if (mineralsCollected >= C) {
            int newSCVs = mineralsCollected / C;
            numSCVs += newSCVs;
            mineralsCollected -= newSCVs * C;
            days += T - 1;
        }
    }

    cout << days << endl;

    return 0;
}