import java.util.*;
public class Main {
public static void main( String[] args ) {
List[HTML_REMOVED][] w=new List[10];
for (int i = 0; i < 10; i) {
w[i]=new ArrayList[HTML_REMOVED]();
}//创建十个集合进行存储一个的数量,i表示目标数,w[i]表示目标价值,w[i].size表示目标数
Scanner scanner = new Scanner(System.in);
int n=scanner.nextInt();
for (int i = 0; i < n; i) {
int a=scanner.nextInt();
int b=scanner.nextInt();
w[a].add(b);
}
int average=n/10;
long res=0;
for (int i = 0; i < 10; i) {
if(w[i].size()>average){
Collections.sort(w[i]);
for (int j = 0; j < w[i].size() - average; j) {
res+=w[i].get(j);
}
}
}
System.out.println(res);
}
}