```cpp
#include<bits/stdc++.h>
using namespace std;
int m,t,s;
int main(){
cin>>m>>t>>s;
if(t==0){
cout<<0<<endl;
return 0;
}
if(s%t==0)cout<<max(m-s/t,0)<<endl;
else cout<<max(m-s/t-1,0)<<endl;
return 0;
}
``````
by conancat @ 2023-12-05 20:22:36