N,d,K=map(int,input().split())
mod=10**9+7

DP=[0]*(K*2+1)
DP[0]=1

for tests in range(N):
    NDP=[0]*(K*2+1)
    for i in range(K+1):
        for j in range(d):
            NDP[i+j+1]+=DP[i]
            NDP[i+j+1]%=mod
    DP=NDP

print(DP[K])