N,d,K = map(int,input().split())
MOD = 10**9+7
dp = [[0 for _ in range(K+1)] for _ in range(N+1)]
cum = [0]*(K+1)
for j in range(1,K+1):
    if j<=d:
        dp[1][j] = 1
    cum[j] = cum[j-1]+dp[1][j]
for i in range(2,N+1):
    dum = [0]*(K+1)
    for j in range(2,K+1):
        m = min(d,j-1)
        dp[i][j] = (cum[j-1]-cum[j-1-m])%MOD
        dum[j] = (dum[j-1]+dp[i][j])%MOD
    cum = dum[:]
print(dp[N][K])