#include <stdio.h>

int main(void) {
    FILE *fp = fopen("input.txt", "r");
    unsigned char map[1000][1000] = {0};
    unsigned x0, x1, y0, y1;
    unsigned intersections = 0;

    while (fscanf(fp, "%u,%u -> %u,%u", &x0, &y0, &x1, &y1) == 4) {
        char inc = 1;
        if (x0 == x1) {
            if (y0 > y1)
                inc = -1;
            for (unsigned y = y0; y != y1; y += inc) {
                map[x0][y]++;
            }
            map[x0][y1]++;
        } else if (y0 == y1) {
            if (x0 > x1)
                inc = -1;
            for (unsigned x = x0; x != x1; x += inc) {
                map[x][y0]++;
            }
            map[x1][y0]++;
        }
    }

    for (unsigned y = 0; y < 1000; y++) {
        for (unsigned x = 0; x < 1000; x++) {
            if (map[x][y] > 1)
                intersections++;
        }
    }

    printf("Answer: %d\n", intersections);
}