#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; cin>>n>>x>>y; if(y%x!=0) if(n>y/x-1) cout<<n-y/x-1; else cout<<0; else if(n>y/x-1) cout<<n-y/x; else cout<<0; return 0; }