#include <iostream>
#include <cmath>

using namespace std;

int main() {
    double S, p, n, m, r, m_tmp;
    cout << "Введите S, m, n: ";
    cin >> S >> m >> n;
    for (long int i = 0; p < 100000; ++i) {
        p = i / 1000;
        r = p / 100;
        m_tmp = (S * r * pow(1+r, n)) / (12*(pow(1+r, n)-1));
        if (m_tmp > m) {
            break;
        };
    }
    cout << "Полученный процент p: " << p << "\n";
}