import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n,l,r = na()
mod = 998244353
nn = 1000000
fact = [1] * nn
for i in range(nn - 1):
    fact[i + 1] = fact[i] * (i + 1) % mod
invfact = [1] * nn
invfact[nn - 1] = pow(fact[nn - 1], mod - 2, mod)
for i in range(nn - 1)[::-1]:
    invfact[i] = invfact[i + 1] * (i + 1) % mod
 
def binom(x, y):
    if x < 0 or y < 0 or x - y < 0:
        return 0
    return fact[x] * invfact[y] % mod * invfact[x - y] % mod


ans = 0
for i in range(r-l+1):
    tx,ty = n, r-i+n
    sx,sy = 1, 0
    ssx, ssy = -r-1, r+2
    #print(tx-sx,ty-sy,tx-ssx, ty-ssy,binom(ty-sy+tx-sx,tx-sx),binom(ty-ssy+tx-ssx,tx-ssx))
    ans += binom(ty-sy+tx-sx,tx-sx)-binom(ty-ssy+tx-ssx,tx-ssx)
    ans %= mod
print(ans)