n,d,k = map(int, input().split())
dp = [[0 for _ in range(k+5)] for _ in range(n+1)]
dp[0][0]=1
mod=10**9+7
for i in range(n):
    imos=[0]*(k+5)
    for j in range(k):
        imos[j+1]+=dp[i][j]
        mxind = min(j+d+1,k+4)
        imos[mxind]-=dp[i][j]

    for j in range(len(imos)-1):
        imos[j+1]+=imos[j]
        imos[j+1]%=mod
    dp[i+1]=imos

print(dp[-1][k]%mod)