666
```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
    double total = 0;  // 改成double
    double price;
    while(1){
        cin >> price;
        if(price == 0) break;
        total += price;
    }
    
    double pay;
    if(total > 100){
        pay = 100 + (total - 100) * 0.9;
    } else {
        pay = total;
    }
    
    printf("%.3f", pay);
    return 0;
}
```


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```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
    double total = 0;  // 改成double
    double price;
    while(1){
        cin >> price;
        if(price == 0) break;
        total += price;
    }
    
    double pay;
    if(total > 100){
        pay = 100 + (total - 100) * 0.9;
    } else {
        pay = total;
    }
    
    printf("%.3f", pay);
    return 0;
}
```


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