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| #include <bits/stdc++.h>
using namespace std;
const double eps = 1e-4;
double W0, W, M;
bool check(double x)
{
double sum = 0, p = 1;
for (double i = 1; i <= M; ++i)
{
p *= (1 + x);
sum += W / p;
}
return sum <= W0;
}
int main()
{
ios::sync_with_stdio(false);
cin >> W0 >> W >> M;
double l = 0, r = 5;
while (r - l > eps)
{
double mid = (l + r) / 2;
if (check(mid))
r = mid;
else
l = mid;
}
printf("%.1lf", l * 100);
return 0;
}
|