import sys
input = sys.stdin.readline

N=int(input())

if N<=2:
    print(0)
    exit()

mod=1000000007

DP=[[0]*2 for i in range(N)]
# 小さい数の個数, 最後の二個は0なら上昇、1なら減少

for i in range(N):
    for j in range(N):
        if i==j:
            continue
        if i<j:
            DP[j-1][0]+=1
        else:
            DP[j][1]+=1
#print(DP)
rest=N-2
for ko in range(2,N):
    NDP=[[0]*2 for i in range(N)]

    for i in range(N):
        for j in range(2):
            if DP[i][j]==0:
                continue
            if j==0:
                if i>=1:
                    NDP[i-1][1]+=DP[i][j]
            else:
                NDP[i][0]+=DP[i][j]

    for i in range(1,N-ko):
        NDP[i][0]+=NDP[i-1][0]
        NDP[i][0]%=mod

    for i in range(N-ko-2,-1,-1):
        NDP[i][1]+=NDP[i+1][1]
        NDP[i][1]%=mod
        

    DP=NDP
    #print(DP)

print(sum(DP[0])%mod)