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

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in = new Scanner(System.in);
		double k = in.nextDouble();
		double p = in.nextDouble();
		double s = in.nextDouble();
		double years = 0;
		if(s > k)
			years = Math.ceil(Math.log(s/k)/Math.log(1+(p/100)));
		System.out.println(years);
	}
}
Success #stdin #stdout 0.16s 321344KB
stdin
1.14	0.08	40.00
stdout
4450.0