import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
mod = int(1e9 + 7)
# mod = 998244353

n = ii()
a = li()
A = 200
ans = 0
for k in range(A + 1):
    dp = [[0] * (k + 1) for m in range(3)]
    dp[0][k] = 1
    for i in range(n):
        nxt = [[0] * (k + 1) for m in range(3)]
        for m in range(3):
            p = m + 1 if m + 1 <= 2 else 2
            for j in range(k + 1):
                nxt[m][j] += dp[m][j]
                if a[i] - k <= 0 and 0 <= j + a[i] - k:
                    nxt[p][j + a[i] - k] += dp[m][j]
        dp = nxt
    ans += dp[2][0]
print(ans)