n = int(input())
c = list(map(int,input().split()))
a = 0
mod = 10 ** 9 + 7
def fa(n,mod):
    a = 1
    for i in range(n):
        a *= i + 1
        a %= mod
    return a
for i in range(9):
    a += (i + 1) * c[i]
s = fa(n,mod)
for i in range(9):
    s //= fa(c[i],mod)
    s %= mod
t = int("1" * n)
print((s * a // n * t) % mod)