MOD = 998244353

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    
    N = int(data[0])
    A = list(map(int, data[1:N+1]))
    
    mod_A = [a % MOD for a in A]
    a_squared = [(a * a) % MOD for a in mod_A]
    
    total = 0
    for k in range(N):
        product = 1
        mod_k_sq = a_squared[k]
        for i in range(N):
            if i == k:
                continue
            term = (a_squared[i] - mod_k_sq) % MOD
            product = (product * term) % MOD
        denom = (mod_A[k] * product) % MOD
        inv_denom = pow(denom, MOD - 2, MOD)
        total = (total + inv_denom) % MOD
    
    print(total)

if __name__ == "__main__":
    main()