#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#define N 666

void *prime(void * pr) {
	long number = *(long)* pr;
	int i, j, end, isPrime;
	int count = 0;

    	for(i=2; i<=number; i++) {
		isPrime = 1;
		for(j=2; j<=i/2; j++) {
            		if(i%j==0) {
                		isPrime = 0;
                		break;
            		}
        	}
        	if(isPrime==1) {
        	 count++;
        	}
    	}
	printf("Number of primes for N=%lu is %d\n",number,count);

}


int main() {

	pthread_t thread[N];
	for(int i = 2; i <= N; i++){
		int f = pthread_create(&thread[i], NULL, prime, (void*)i);

		if(f) { exit(-1); }

	}
	return 0;
}