Saving For Retirement Solution:

#include <bits/stdc++.h>

using namespace std;

int main(){

    // #ifndef ONLINE_JUDGE
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    // #endif

    int b_init, b_end, b_save, a_init, a_save;
    cin >> b_init >> b_end >> b_save >> a_init >> a_save;

    int b_total = (b_end - b_init) * b_save;
    int years = 0;
    while(++years * a_save <= b_total);
    cout << years + a_init;

    return 0;
}