题解

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    double x,sum=0;
    while(cin>>x){
        sum+=x;
    }
    if(sum>100){
        printf("%.3f",(sum-100)*0.9+100);
    }else{
        printf("%.3f",sum);
    }
    return 0;
}