题解

#include<iostream>
using namespace std;
int main(){
    int a,b,c,d,k,sum=0;
    cin>>a>>b>>c>>d>>k;
    if(k>d){
        sum+=d*4;
        k-=d;
    }else{
        sum+=k*4;
        k=0;
    }
    if(k>c){
        sum+=c*3;
        k-=c;
    }else{
        sum+=k*3;
        k=0;
    }
    if(k>b){
        sum+=b*2;
        k-=b;
    }else{
        sum+=k*2;
        k=0;
    }
    if(k>a){
        sum+=a;
        k-=a;
    }else{
        sum+=k;
        k=0;
    }
    cout<<sum;
    return 0;
}