#include <iostream>
#include <iomanip>
using namespace std;
int main(){
  int p,q,a;cin>>p>>q>>a;
  if(p <= q){
    cout << 1000000000 << endl;
    return 0;
  }
  //((100+q)/100)x+a = ((100+p)/100)x
  double A = (double)(100+q)/100;
  double B = (double)(100+p)/100;
  //Ax+a = Bx
  //a = x(B-A)
  double C = B-A;
  //a = xC
  int x = (double)a/C;
  //cout << fixed << setprecision(8);
  //cout << A << " " << B << " " << C << " " << x << endl;
  int ans = x;
  while(x*A+a-x*B < 2.0 && ans > 0){
    int X = x*A+a;
    int Y = x*B;
    if(X == Y){
      ans--;
      //cout << "!!" << x << ": " << x*A+a << " " << x*B << endl;
    }else{
      //cout << x << ": " << x*A+a << " " << x*B << endl;
    }
    x--;
  }
  cout << max(0,(int)ans) << endl;
}