#include <stdio.h> int calcu(int n, int count) { if (n == 0) return count; else if (n < 0) return -1; else { if (n % 8 == 0) return count + (n / 8); else { int res = calcu(n - 6, count + 1); return res; } } } int main() { int n = 0; scanf("%d", &n); int ret = calcu(n, 0); prin...