#include <stdio.h>
#include <stdlib.h>

int grid[1000][1000] = {0};

void draw(int x1, int y1, int x2, int y2) {
    int r = x1;
    int c = y1;
    int rstep = x1 == x2 ? 0 : (x1 < x2 ? 1 : -1);
    int cstep = y1 == y2 ? 0 : (y1 < y2 ? 1 : -1);
    while (r != x2 || c != y2) {
        grid[r][c]++;
        r += rstep;
        c += cstep;
    }
    /* loop stops before marking last point! */
    grid[x2][y2]++;
}

int main(void) {
    int x1, y1, x2, y2;
    while (scanf("%d,%d -> %d,%d\n", &x1, &y1, &x2, &y2) != EOF) {
        draw(x1, y1, x2, y2);
    }
    
    int count = 0;
    for (int r = 0; r < 1000; r++) {
        for (int c = 0; c < 1000; c++) {
            if (grid[r][c] > 1) {
                count++;
            }
        }
    }
    printf("%d\n", count);
    return 0;
}