#include<stdio.h>
#include<math.h>
#define A 100
int main() {
    int n, Sum, ax[A] = { 0 }, ay[A] = { 0 }, count[A] = { 0 }, i, j;
    double s, t, sum;
    sum = 0;
    scanf("%d", &n);
    for (i = 0; i < n; i++) {
        scanf("%d %d %d", &ax[i], &ay[i], &count[i]);
    }
    for (j = 0; j < n; j++) {
        s = sqrt(ax[j] * ax[j] + ay[j] * ay[j]);
        t = (s / 50) * 2;
        sum = t + 1.5 * count[j]+sum;
    }
    Sum = ceil(sum);
    printf("%d", Sum);
    return 0;
}