MOD = 10**9+7
N = int(input())
C = [0]+list(map(int,input().split()))
A = list(range(N+1))
A[0] = 1
for i in range(2,N+1):
    A[i] = (i*A[i-1])%MOD
ans = 0
for i in range(1,9+1):
    ans = (ans+i*C[i])%MOD
ans = (ans*(pow(10,N,MOD)-1)*pow(9*N,MOD-2,MOD))%MOD
prod = A[N]
for i in range(1,9+1):
    prod = (prod*pow(A[C[i]],MOD-2,MOD))%MOD
ans = (ans*prod)%MOD
print(ans)