#include <stdio.h>
#include <math.h>

int main()
{
    int n;
    scanf("%d", &n);
    int num[n][3];
    for (int i = 0; i < n;i++){
        for (int j = 0; j < 3; j++){
            scanf("%d", &num[i][j]);
        }
    }
    double sum = 0;
    for (int i = 0; i < n;i++){
        sum += sqrt(num[i][0]*num[i][0] + num[i][1]*num[i][1]) / 50.0 * 2 + num[i][2] * 1.5;
    }
    int sum_ = (int)ceil(sum); // 向上取整
    printf("%d", sum_);

    return 0;
}