def count_claps(n):
total_claps = 0
for i in range(1, n + 1):
num_str = str(i)
claps = 0
for digit in num_str:
if digit in '369':
claps += 1
total_claps += claps
return total_claps
n = int(input())
result = count_claps(n)
print(result)
ZGVmIGNvdW50X2NsYXBzKG4pOgogICAgdG90YWxfY2xhcHMgPSAwCiAgICBmb3IgaSBpbiByYW5nZSgxLCBuICsgMSk6CiAgICAgICAgbnVtX3N0ciA9IHN0cihpKQogICAgICAgIGNsYXBzID0gMAogICAgICAgIGZvciBkaWdpdCBpbiBudW1fc3RyOgogICAgICAgICAgICBpZiBkaWdpdCBpbiAnMzY5JzoKICAgICAgICAgICAgICAgIGNsYXBzICs9IDEKICAgICAgICB0b3RhbF9jbGFwcyArPSBjbGFwcwogICAgcmV0dXJuIHRvdGFsX2NsYXBzCgpuID0gaW50KGlucHV0KCkpCgpyZXN1bHQgPSBjb3VudF9jbGFwcyhuKQpwcmludChyZXN1bHQp