#include <stdio.h>

int main()
{
    int z, n, i;
    int tx, ty, tm;
    int x, y, m;

    z = 1;
    while (scanf (" %d", &n) && n >= 0) {
        tx = ty = tm = 0;

        for (i = 0; i < n; i++) {
            scanf (" %d %d %d", &x, &y, &m);
            tx += x*m;
            ty += y*m;
            tm += m;
        }

        printf("Case %d: %.2lf %.2lf\n", z++, (double)tx/(double)tm, (double)ty/(double)tm);
    }

    return 0;
}