#include<bits/stdc++.h>
using namespace std;
int a,b,c,d=0,my=0,my1=0,i;
int main(){
    cin>>a>>b>>c;
    i=b;
    do{
        if(i>=a)
        my=((i/a)+(i%a));
        if(i<a)
        my+=i;
        if(my>my1){
        my1=my;
        my=0;}
        i++;
	}while(i<=c);
    cout<<my1<<endl;
    return 0;
}