import itertools
N,d,K = map(int,input().split())
mod = 10**9+7
DP = [0]*((N+2)*d)
DP[0] = 1
lenDP = len(DP)
for _ in range(N):
    TEMP = [0]*(lenDP)
    for i in range(lenDP):
        if DP[i]>=1:
            TEMP[i+1]+=DP[i]
            TEMP[i+d+1]-=DP[i]
    DP = list(itertools.accumulate(TEMP))
    for i in range(lenDP):
        DP[i]=DP[i]%mod
print(DP[K])