import sys
input = sys.stdin.readline

mod=10**9+7

N=int(input())

DPA=[0]*(N+100)
DPB=[0]*(N+100)
DPC=[0]*(N+100)

DPA[1]=1
DPB[2]=1
DPC[3]=1

for i in range(N):
    DPB[i+2]+=DPA[i]
    DPC[i+3]+=DPA[i]

    DPA[i+1]+=DPB[i]
    DPC[i+3]+=DPB[i]

    DPA[i+1]+=DPC[i]
    DPB[i+2]+=DPC[i]

    DPA[i]%=mod
    DPB[i]%=mod
    DPC[i]%=mod

print((DPA[N]+DPB[N]+DPC[N])%mod)