#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> using namespace std; int main(){ int n,x,y; int>>n>>x>>y; x*n=y; num=n-y/x; if(y%x !=0) num--; if(num <=0) cout<<0<<endl; else cout<<num<<eldl; return 0; }