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After reading your comment I came to a conclusion that my assumption about EOF was wrong so I went to re-read information about EOF and noticed that I need to enter ctrl+z instead of -1.
With that...

#include <stdio.h>
#include <stdlib.h>
#define N 5


int main()
{
int counter = 0, num = 0;
int memory[N];
while(scanf("%d", &num) != EOF){