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 x in S:
        initial[x] += 1
    
    visited = set()
    queue = deque()
    initial_state = tuple(sorted(initial.items()))
    visited.add(initial_state)
    queue.append(initial_state)
    
    count = 0
    
    while queue:
        current = queue.popleft()
        current_dict = defaultdict(int)
        for x, cnt in current:
            current_dict[x] = cnt
        
        count = (count + 1) % MOD
        
        elements = list(current_dict.keys())
        m = len(elements)
        for mask in range(1, 1 << m):
            subset = []
            for i in range(m):
                if (mask >> i) & 1:
                    subset.append(elements[i])
            subset = list(subset)
            mex = 0
            while mex in subset:
                mex += 1
            new_dict = current_dict.copy()
            for x in subset:
                new_dict[x] -= 1
                if new_dict[x] == 0:
                    del new_dict[x]
            new_dict[mex] += 1
            
            new_state = tuple(sorted(new_dict.items()))
            if new_state not in visited:
                visited.add(new_state)
                queue.append(new_state)
    
    print(count % MOD)

if __name__ == "__main__":
    main()