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#include <iostream> #include <vector> #include <algorithm> using namespace std; int n; string a; int memo[200000][8]; int f(int i,int remainder){ if(i == n && remainder == 0){ return 1; } if(i == n && remainder != 0){ return 0; } if(memo[i][remainder] != -1 ){ return memo[i][remainder]; } int res = 0; int mod = 1e9 +7; res += f(i+1,remainder)+ f(i+1,((remainder*10 + (a[i]-'0'))%8)); res %= mod; return memo[i][remainder] = res; } int main() { cin >>n; cin >>a; for (int i = 0; i < n; i++) { for (int j = 0; j < 8; j++) { memo[i][j] = -1; } } cout << f(0,0) -1; }
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