from scipy.special import zeta
x=int(input())
if x == 2:
  print(pow(10,6));exit()
MAX = pow(10,2)
ans = 0
for n in range(x,MAX):
  temp = zeta(n)*pow(10,6) - pow(10,6)
  #temp *= pow(10,6)
  ans += temp
  #print(temp)
#print(ans)
ans = int(ans)
print(ans)