题解

#include<iostream>
#include<cmath>
using namespace std;
int n,a,b;
int main(){
    cin>>n;
    int i=n/11;
    int j=n%11/5;
    int k=n%11%5;
    a=i+j+k;
    i=n/11-1;
    j=(n-11*i)/5;
    k=n-i*11-5*j;
    b=i+j+k;
    cout<<min(a,b);
}