#include <stdio.h>
#define MAX 100

int main(){
	FILE *fp=NULL;
	int cnt=0;
	char line[MAX];

	fp = fopen("tekst.txt", "r");
	if(fp == NULL){
		printf("-1\n");
		return 1;
	}

	while(1){
		fgets(line,MAX,fp);
		if(feof(fp))
			break;
		cnt++;
	}
	printf("%d\n", cnt);

	fclose(fp);
	return 0;
}