n=int(input())
c=list(map(int,input().split()))
a=[1]*(n+1)
mod=10**9+7
for i in range(1,n+1):
  a[i]=(a[i-1]*i)%mod
num=a[n-1]
for i in range(9):
  num=num*pow(a[c[i]],mod-2,mod)
  num%=mod
cnt=0
for i in range(9):
  cnt+=(i+1)*num*c[i]
  cnt%=mod
print(cnt*(pow(10,n,mod)-1)*pow(9,mod-2,mod)%mod)