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

int main() {
    int N;
    scanf("%d", &N);
    
    char strings[N][101]; // Array to store the strings
    for (int i = 0; i < N; i++) {
        scanf("%s", strings[i]);
    }

    int count = 0; // Variable to count the number of distinct concatenated strings

    // Iterate over each pair of adjacent strings and check if the concatenated string is distinct
    for (int i = 1; i < N; i++) {
        char concatenated[201]; // Array to store the concatenated string
        strcpy(concatenated, strings[i]);
        strcat(concatenated, strings[i-1]);

        // Check if the concatenated string is distinct from the previous concatenated string
        int distinct = 1;
        for (int k = 0; k < i; k++) {
            if (strcmp(concatenated, strings[k]) == 0) {
                distinct = 0;
                break;
            }
        }

        // If the concatenated string is distinct, increment the count
        if (distinct) {
            count++;
        }

        // Concatenate the strings in the reverse order and check if it's distinct
        strcpy(concatenated, strings[i-1]);
        strcat(concatenated, strings[i]);
        distinct = 1;
        for (int k = 0; k < i; k++) {
            if (strcmp(concatenated, strings[k]) == 0) {
                distinct = 0;
                break;
            }
        }

        // If the concatenated string is distinct, increment the count
        if (distinct) {
            count++;
        }
    }

    printf("%d\n", count);

    return 0;
}