N = int(input())
ans = 0
for a in range(10):
    for b in range(10):
        if a==b:continue
        high = a*N+N*b+1
        low = 0
        while high-low>1:
            mid = (high+low)//2
            if N*(mid*a+b)>mid**2-1:
                low = mid
            else:
                high = mid
        pmax = low
        if pmax>=max(a+1,b+1,2):
            ans += pmax-max(a+1,b+1,2)+1
print(ans)