// editor1
#include<stdio.h>
#include<ctype.h>
typedef struct def{
    float x;
    float y;
    float z;
    float r;
};

int main(){
    int size,n;
    float x,y,z,r;
    scanf("%d",&size);
   
    struct def arr[n];
    for(int i=1;i<=size;i++){
        scanf("%lf",*arr[i].x);
    }
    printf("%.1lf",x);
    return 0;
    
}