#include <iostream>

using namespace std;

int main()
{
   double ms_HCl, ms_NaOH, c_HCl, c_NaOH, md_HCl, md_NaOH, M_NaOH, M_HCl;
   int A_Na = 23, A_O = 16, A_H = 1, A_Cl = 35;
   cin >> ms_HCl;
   cin >> c_HCl;
   cin >> c_NaOH;
   md_HCl = c_HCl * ms_HCl / 100;
   M_NaOH = A_Na + A_O + A_H;
   M_HCl = A_H + A_Cl;
   md_NaOH = M_NaOH * md_HCl / M_HCl;
   ms_NaOH = md_NaOH * 100 / c_NaOH;
   cout << ms_NaOH << endl;
   return 0;
}