import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()
ans = 0
for a in range(10):
    for b in range(10):
        if a == b:
            continue
        l = max(a,b)
        ok = 1
        ng = 10**18
        while abs(ok - ng) > 1:
            d = ok+ng>>1
            if (d * a + b)*n > d ** 2 - 1:
                ok = d
            else:
                ng = d
        #print(a,b,l,ok)
        ans += max(ok-l, 0)
print(ans)