#include<stdio.h>
#include<math.h>
#include<algorithm>
#include<queue>
#include<deque>
#include<string>
#include<string.h>
#include<vector>
#include<set>
#include<map>
#include<stdlib.h>
#include<cassert>
using namespace std;
const long long mod=1000000009;
const long long inf=mod*mod;
const long long d2=500000004;
const double EPS=1e-10;
const double PI=acos(-1.0);
int ABS(int a){return max(a,-a);}
long long ABS(long long a){return max(a,-a);}
int main(){
long long a,b,c,d,e;
scanf("%lld%lld%lld%lld%lld",&a,&b,&c,&d,&e);
b=min(b,a*2);
c=min(c,b*2);
d=min(d,c*2);
long long ret=0;
ret+=e/2*d;
e%=2;
ret+=c*e;
printf("%lld\n",ret);
}
./Main.cpp: In function ‘int main()’:
./Main.cpp:24:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%lld%lld%lld%lld%lld",&a,&b,&c,&d,&e);
^