#include<stdio.h>
int main()
{
    int x;
  	int	i = 1;
  	int money = 100;
	scanf("%d", &x);
  	
	double rate;
  	while(1){
      	rate = money * 0.01;
    	money += rate;
      	if(k <= money){
        	break;	
       	}
      	i++;
    }

  	puts(i);
 
    return 0;
}
