Timus 1025

#include<stdio.h>
//resubmission
int main()
{
    int j,i,n,x[105],temp,s;
    scanf("%d",&n);
    for(i=0;i<n;i++){
        scanf("%d",&x[i]);
    }
    for(i=0;i<n;i++){
        for(j=i+1;j<n;j++){
            if(x[i]>x[j]){
                temp=x[i];
                x[i]=x[j];
                x[j]=temp;
            }
        }
    }
    s=0;
    for(i=0;i*2<n;i++){
        s=s+(x[i]+2)/2;
    }
    printf("%d\n",s);
    return 0;
}