n = int(input())
ans = 0
for a in range(10):
    for b in range(10):
        if a==b: continue
        ok = 1; ng = 10**9+1
        while ng-ok>1:
            mid = (ok+ng)//2
            if a*n+b*n//mid>=mid: ok = mid
            else: ng = mid
        ans += max(ok-max(a,b),0)
print(ans)