#include<stdio.h>
int main(void)
{
unsigned int value, per, i;
bool prime;
printf("Please enter a positive integer: ");
while (scanf_s("%u", &value) != 0 && value>0);
{
for (per = 2; per <= value; per++)
{
for (prime = 1, i = 2; i * i <= per; i++)
{
if (per % i == 0)
prime = 0;
}
if (prime == 1)
printf("%u ", per);
}
putchar('\n');
}
return 0;
}