import java.math.*;
import java.util.*;
import java.io.*;

class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        long P = sc.nextLong();
        long Q = sc.nextLong();
        long A = sc.nextLong();
        if (P < Q) {
            System.out.println(1e9);
            return;
        }
        if (A == 0) {
            System.out.println(0);
            return;
        }
        long ans = Math.max(0, (A - 1) * 100 / (P - Q) - 1);
        for (long x = Math.max(1, (A - 1) * 100 / (P - Q)); x <= (A + 1) * 100 / (P - Q); ++x) {
            if ((P + 100) * x / 100  < (Q + 100) * x / 100 + A ) ++ans;
        }
        System.out.println(ans);
    }
}