N,d,K=map(int, input().split())
mod=10**9+7
dp=[[0 for i in range(K+1)] for j in range(N+1)]
dp[0][0]=1
f=0
for i in range(K+1):
    if i==0:
        dp[1][i]=0
    elif i<min(d+1,K):
        f+=1
        dp[1][i]=f 
    else:
        dp[1][i]=f 

for i in range(1,N):
    for j in range(1,K+1):
        if j-d-1>0:
            dp[i+1][j]=dp[i][j-1]-dp[i][j-d-1]+dp[i+1][j-1]
            dp[i+1][j]%=mod
        else:
            dp[i+1][j]=dp[i][j-1]+dp[i+1][j-1]
            dp[i+1][j]%=mod
        if dp[i+1][j]<0:
            dp[i+1][j]=0

        
print((dp[-1][-1]-dp[-1][-2])%mod)