#include<stdio.h>
#include <stdlib.h>

int main(void){

double pass = 0;
int fail = 0;
double counter = 0;
int result = 0;
double rate = 0;

while(result != -1){
	printf("Enter result(1=pass,2=fail,-1=end)");
	scanf("%d",&result);
	if(result==1){
		pass = pass + 1;
	}
	else{
		fail = fail + 1;
	}
	counter = counter + 1;
}

printf("%d人通過%f人未通過",pass,fail);

rate = pass/counter;
if(rate >= 0.8){
	puts("補習費漲價");
}
return 0;
}