#include <stdio.h>
#include<stdlib.h>
#define flush while((getchar()) != '\n')

struct sinhvien
{
	char name[100];
	int nums;
	float p[3];

};
int count()
{
	FILE *quanly =fopen()

	int c = 0; int temp = fgetc(quanly);
	while (temp != EOF)
	{
		c++;
		fseek(quanly, sizeof(struct sinhvien)*c, SEEK_SET);
	}
	fclose(quanly);
	return c;

}
void add(int n)
{
	int c = count();
	for (int i = 1; i <= n; i++)
	{
		struct sinhvien sv;
		sv.nums = i + c;
		flush;
		gets(sv.name);
		for(int i=0;i<n;i++)
		{
			scanf("%f", &sv.p[i]);
				fseek(quanly, 0, SEEK_END);
				fwrite(&sv, sizeof(sv), 1, quanly);
		}

	}


}