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