#include <stdio.h>

int main()
{
	long x;
	double i;
	int r;

	i = 100;
	r = 0;
	// scanf("%ld", &x);
	x = 1000000000000000000;
	while (i <= x)
	{
		i *= 1.01;
		i = (double)(long)i;
		r++;
	}
	printf("%d\n", r);
}