mod = 998244353
N = 10**6 + 5
fact = [1]*(N+1)
factinv = [1]*(N+1)

for i in range(2, N+1):
	fact[i] = fact[i-1] * i % mod

factinv[-1] = pow(fact[-1], mod-2, mod)
for i in range(N-1, 1, -1):
	factinv[i] = factinv[i+1] * (i+1) % mod

def cmb(a, b):
	if (a < b) or (b < 0):
		return 0
	return fact[a] * factinv[b] % mod * factinv[a-b] % mod


n,l,u = map(int,input().split())

ans = 0
for i in range(l + n - 1, u + n + 1):
	ans += cmb(i + n, n - 1) - cmb(i + n, i - u - 1)
	ans %= mod
print(ans)