#include<bits/stdc++.h> using namespace std; int main(){ int a,b,c; a=5; b=8; c=12; printf("%.3lf\n",(a+b+c)/3.0); printf("%d %d\n", 39/a, 39/a); printf("%d %d\n", 39/b, 39/b); printf("%d %d\n", 39/c, 39/c); return 0; }