>>291
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(){
    int i, n, h = 0;
    printf("n = "), scanf("%d", &n);
    srand((unsigned)time(NULL));
    for(i = 0; i < n; i++) h += rand() % 2;
    printf("head: %d\ntail: %d\n", h, n - h);
    return 0;
}