#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

//Complete the following function.

int marks_summation(int* marks, int number_of_students, char gender) {
  //Write your code here.
  int sum = 0;
  for(int i = (gender == 'b' ? 0 : gender == 'g' ? 1 : -1); i < number_of_students; i+=2) {
    sum += marks[i];
  }
  return sum;
}

int main() {
    int number_of_students;
    char gender;
    int sum;
  
    scanf("%d", &number_of_students);
    int *marks = (int *) malloc(number_of_students * sizeof (int));
 
    for (int student = 0; student < number_of_students; student++) {
        scanf("%d", (marks + student));
    }
    
    scanf(" %c", &gender);
    sum = marks_summation(marks, number_of_students, gender);
    printf("%d", sum);
    free(marks);
 
    return 0;
}

int marks_summation(int* marks, int number_of_students, char gender)
{
    // Write your code here.
    int sum = 0;
    int i = (gender == 'g');

    while (i < number_of_students) {
        sum += marks[i];
        i += 2;
    }
    return sum;
}

int marks_summation(int* marks, int number_of_students, char gender) {
   int sum=0;
   char g,b;
   for(int i=0;i<number_of_students;i++){
       if(i%2!=0 && gender=='g'){
           sum+=marks[i];
       }
       else if(i%2==0 && gender=='b'){
           sum+=marks[i];
       }
   }
   return sum;
}