#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

int main(){
  ll P, Q, A;
  cin >> P >> Q >> A;

  if(P==Q){
    if(A==0) cout << 0 << endl;
    else cout << 1000000000 << endl;
  }else if(P<Q){
    cout << 1000000000 << endl;
  }else if(P>Q){
    ll ret = 0;
    ll x = 1;
    while(true){
      ll X = (1.0 + P/100.0) * x;
      ll Y = (1.0 + Q/100.0) * x; Y += A;
      if(X < Y) ret++;
      if(abs(X-Y) > A) break;
      x++;
    }      
    cout << ret << endl;
  }
  
  return 0;
}