#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,x,y,a; cin>>n>>x>>y; a=y/x; if(y%x!=0) a++; if(a>=n) cout<<0<<endl; else cout<<n-a<<endl; return 0; }