```cpp
#includde<bits/stdc++.h>
using namepace std
int main() {
double m,t,s;
cin>>m>>t>>s;
if(t==0){
cout<<"0"<<endl;
return 0;
}
int a=m-s/t
if(a<=0)
cout<<"0"<<endl;
else
cout<<a<<endl;
return 0;
}
```
by HuangGuangWu666 @ 2023-11-27 12:58:08
如果虫子可以在$＜$这个时间内吃完所有呢
by w123ak @ 2023-11-29 22:14:27