#include <stdio.h>

int main(void)
{
int data[10];
int i;
int count = 0;

data[0] = 1;
data[1] = 2;

for (i = 2; i < 10; i=i+1) {
data[i] = 3 * data[i - 1] + 2 * data[i - 2];
}

for (i = 0; i < 10; i=i+1) {
if (data[i] >= 100 && data[i] <= 10000) {
count=count+1;
}
}


printf("%d\n", count);
return 0;
}