#include <stdio.h>
int main() {
int n, count = 0;
scanf("%d", &n);//输入四位数的个数
int num;
for (int i = 0; i < n; i++) {//通过循环读取每个四位数,并计算出,千位,百位,十位,个位 scanf("%d", &num);
int units = num % 10;
int thousands = num / 1000;
int hundreds = (num / 100) % 10;
int tens = (num / 10) % 10;
int diff = units - thousands - hundreds - tens;
if (diff > 0) {//判断是否符合 count++;//记录满足的四位数个数
}
}
printf("%d", count);//输出结果
return 0;
}