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#include <bits/stdc++.h> using namespace std; int dp[200005][8]; int n; string s; int module=1000000007; int rec(int i, int remainder){ if((i==n)and(remainder==0)){ return(1); } if(i==n){ return(0); } if(dp[i][remainder]!=-1){ return(dp[i][remainder]); } int result=0; result+=rec(i+1, remainder); result+=rec(i+1, (remainder*10+(s[i]-'0'))%8); result%=module; dp[i][remainder]=result; return(result); } int main() { cin>>n; cin>>s; for(int i=0; i<n; i++){ for(int j=0; j<8; j++){ dp[i][j]=-1; } } cout<<rec(0, 0)-1; }
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