N=int(input())
if N in (1,2):
    ans=0
else:
    mod=10**9+7
    dp=[1]
    for i in range(1,N):
        prev=[0]+dp
        for j in range(1,i+1):
            prev[j]+=prev[j-1]
            prev[j]%=mod
        if i%2:
            dp=[(prev[j]-prev[0])%mod for j in range(i+1)]
        else:
            dp=[(prev[i]-prev[j])%mod for j in range(i+1)]
    ans=sum(dp)*2%mod
print(ans)