n,d,k = map(int, input().split())

dp1=[0]*(d*n+1)
dp2=[0]*(d*n+1)

dp1[0]=1

for cnt in range(n):
    if cnt%2==0:
        dp2=[0]*(d*n+1)
    else:
        dp1=[0]*(d*n+1)

    for i in range(len(dp1)):
        if cnt%2==0:
            for j in range(1,d+1):
                if i+j < len(dp1):
                    dp2[i+j] += dp1[i]
                    dp2[i+j] %= 10**9+7
        else:
            for j in range(1,d+1):
                if i+j < len(dp1):
                    dp1[i+j] += dp2[i]
                    dp1[i+j] %= 10**9+7
if n%2==0:
    print(dp1[k])
else:
    print(dp2[k])