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

void main(void){
	int n = 0 ;
    scanf("%d",&n);
    char str[n][200];
    for(int i = 0 ; i < n ; i++ ){
        scanf("%s",str[i]);
    }
    int count = 0 ;
    for(int i = 0 ; i < n ; i++){
        for(int j = i+1 ; j < n ; j++){
            char strA[1000] = "";
            char *strXY = strcat(strA,str[i]);
            strXY = strcat(strA,str[j]);
            char strB[1000] = "";
            char *strYX = strcat(strB,str[j]);
            strYX = strcat(strB,str[i]);
            if(strcmp(strXY,strYX) == 0){
                count++;
            }else{
                count += 2;
            }
        }
    }
    printf("%d",count);
}