.苹果和虫子

#include<bits/stdc++.h>
using namespace std;
int main( ){
int m,t,s;
cin>>m>>t>>s;
int apple;
if(t0)apple=0;
else{
if(s%t0)apple =m-s/t;
else apple =m-s/t-1;
if(apple<0)apple=0;
}
cout<<apple;

return 0;
}