## https://yukicoder.me/problems/no/2625

MOD = 998244353
MAX = 10 ** 5

def main():
    N = int(input())
    A = list(map(int, input().split()))

    dp = [0] * (MAX + 1)
    dp[0] = 1
    cum_dp = [1] * (MAX + 1)

    prev = 0
    for i in range(N):
        new_dp = [0] * (MAX + 1)

        for b in range(MAX - A[i] + 1):
            if b - max(0, prev - A[i]) >= 0:
                new_dp[b] = cum_dp[b - max(0, prev - A[i])]
        dp = new_dp

        cum_dp = [0] * (MAX + 1)
        a = 0
        for b in range(MAX + 1):
            a += dp[b]
            a %= MOD
            cum_dp[b] = a    
        prev = A[i]
    
    answer = 0
    for b in range(MAX + 1):
        answer += dp[b]
        answer %= MOD
    print(answer)

    






if __name__ == "__main__":
    main()