#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){
    ll ret = 1000000000;
    REP(x,1,1000000){
      ll X = (100 + P) * x / 100.0;
      ll Y = (100 + Q) * x / 100.0;
      Y += A;

      if(X >= Y) ret--;
    }
    cout << ret << endl;
    return 0;
  }
  else if(P == Q){
    if(A == 0) cout << 0 << endl;
    else cout << 1000000000 << endl;
    return 0;
  }
  // P > Q
  ll lb = 1, ub = 1000000001;
  while(ub-lb>1){
    ll x = (lb+ub)/2;

    ll X = (100 + P) * x / 100.0;
    ll Y = (100 + Q) * x / 100.0;
    Y += A;
    if(X < Y) lb = x;
    else ub = x;
  }
  ll ret = lb;
  REP(i,1,1000000){
    {
      ll x = lb - i + 1;
      if(x >= 1){
        ll X = (100 + P) * x / 100.0;
        ll Y = (100 + Q) * x / 100.0;
        Y += A;
        if(X == Y) ret--;
      }
    }
    {
      ll x = lb + i;
      if(x <= 1000000000){
        ll X = (100 + P) * x / 100.0;
        ll Y = (100 + Q) * x / 100.0;
        Y += A;
        if(X < Y) ret++;
      }
    }      
  }

  cout << ret << endl;
  
  return 0;
}