#include <stdio.h>
#include <stdlib.h>

int main()
{
    int *heap;
    int n;
    double sum=0;
    int i;
    
    scanf("%d",&n);
    heap=(int*)malloc(sizeof(double)*n);
    if(heap=NULL)exit(0);
    
    
    for(i=0;i<=n-1;i++){
        scanf("%f",&heap[i]);
        sum+=heap[i];
    }
    
    printf("%f",sum);
    
    free(heap);
    return 0;
}