import sys
stdin=sys.stdin

ip=lambda: int(sp())
fp=lambda: float(sp())
lp=lambda:list(map(int,stdin.readline().split()))
tp=lambda:tuple(map(int,stdin.readline().split()))
sp=lambda:stdin.readline().rstrip()
yp=lambda:print('Yes')
np=lambda:print('No')

n=ip()
mod=10**9+7
dp0=[0 for _ in range(10**6+10)]
dp1=[0 for _ in range(10**6+10)]
dp0[1]=1
dp1[1]=0
dp0[2]=1
dp1[2]=1
for  i in range(3,10**6+10):
    dp0[i]+=dp1[i-1]+(dp1[i-2])%mod
    dp1[i]+=dp0[i-1]%mod

print((dp0[n]+dp1[n])%mod)