import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
mod=10**9+7
if n==1:
  print(1)
else:
  D=[[0]*3 for _ in range(n)]
  D[1][0]=1
  D[1][1]=1
  D[1][2]=0
  for i in range(2,n):
    D[i][0]=D[i-1][2]
    D[i][1]=D[i-1][0]+D[i-1][2]
    if D[i][1]>mod:
      D[i][1]%=mod
    D[i][2]=D[i-1][1]
  print(sum(D[-1])%mod)