#include<stdio.h>
#define _CRT_SECURE_NO_WARNINGS
int main()
{
	double a, b;
	int i = 0;
	a = 100;scanf_s("%lf", &b);
	while (a <= b)
	{
		a *= 1.01;
		a = (int)a / 1;
		i++;
	}
	printf("%d", i);
	return 0;
}