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#include <iostream>

#include <string.h>

using namespace std;

int a[4];

string s;

int main(){

cin>>a[0]>>a[1]>>a[2]>>a[3];

cin>>s;

long long int ans = 0;

for(int i=0; i<s.size(); i++){

int t = s[i]-'0';

t -= 1;

ans += a[t];

}

cout<<ans<<endl;

return 0;

}