#include <stdio.h>

int main() {
    int A[10][10] = {
        {0,1,2,3,4,5,6,7,8,9},
        {10,11,12,13,14,15,16,17,18,19},
        {20,21,22,23,24,25,26,27,28,29},
        {30,31,32,33,34,35,36,37,38,39},
        {40,41,42,43,44,45,46,47,48,49},
        {50,51,52,53,54,55,56,57,58,59},
        {60,61,62,63,64,65,66,67,68,69},
        {70,71,72,73,74,75,76,77,78,79},
        {80,81,82,83,84,85,86,87,88,89},
        {90,91,92,93,94,95,96,97,98,99}
    };
    int input = 0;
    int i = 0;
    int sum = 0;
    scanf("%d", &input);
    for (i = 0; i < 10; i++) {
        sum += *(*(A + i) + ((i + input) % 10));
    }
    printf("%d\n", sum);
    return 0;
}