为什么输入了数字后cnt还是0

#include<bits/stdc++.h>
using namespace std;
int arr[1001]={};
int main(){
/*
freopen (".in","r",stdin);
freopen (".out","w",stdout);
*/
int k=0,cnt=0;
while(scanf("%d",&arr[k++])!=EOF){
	cnt+=arr[k];
} 
k--;
cout<<cnt*pow(2,k-1);






/*
fclose(stdin);
fclose(stdout);
*/
	return 0;
}