题解

#include<bits/stdc++.h>
#include<cmath>
using namespace std;
int main(){
    long long x,y,z;
    double t;
    cin>>x>>y>>z;
    t=(x+y+z)*1.0/3;
    long long m=ceil(t);
    t=(3*x+5*y+7*z)*1.0/4;
    long long n=ceil(t);
    t=(11*x+13*y+17*z)*1.0/5;
    int h=ceil(t);
    long long g=h+n+m;
    t=g*1.0/7;
    long long u=ceil(t);
    cout<<u;
    return 0;
}