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

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