import sys
from collections import deque

MOD = 998244353

def main():
    N = int(sys.stdin.readline())
    S = list(map(int, sys.stdin.readline().split()))
    
    from collections import defaultdict
    initial = defaultdict(int)
    for s in S:
        initial[s] += 1
    
    visited = set()
    queue = deque()
    
    initial_tuple = frozenset(initial.items())
    visited.add(initial_tuple)
    queue.append(initial)
    
    while queue:
        current = queue.popleft()
        current_tuple = frozenset(current.items())
        
        elements = list(current.keys())
        n = len(elements)
        
        from itertools import combinations
        
        for mask in range(1, 1 << n):
            subset = []
            for i in range(n):
                if mask & (1 << i):
                    subset.append(elements[i])
            subset_set = set(subset)
            mex = 0
            while mex in subset_set:
                mex += 1
            
            new_state = defaultdict(int, current)
            valid = True
            for x in subset:
                if new_state[x] == 0:
                    valid = False
                    break
                new_state[x] -= 1
                if new_state[x] == 0:
                    del new_state[x]
            if not valid:
                continue
            
            new_state[mex] += 1
            
            new_state_tuple = frozenset(new_state.items())
            if new_state_tuple not in visited:
                visited.add(new_state_tuple)
                queue.append(new_state)
    
    print(len(visited) % MOD)

if __name__ == "__main__":
    main()