N=int(input())
if N>10**7:
  exit()
  
mod=998244353
ans=(1+N)*N//2
for i in range(2,N+1):
  for j in range(1,N+1):
    d=N-j*i+1
    if d<=0:
      break 
    ans+=d 
    ans%=mod
print(ans)