#include<iostream>
using namespace std;
int main()
{
//freopen("candy.in","r",stdin);
//freopen("candy.out","w",stdout);
int a,b,t=0,s=0,n,l,r,max=0,sum=0;
cin>>n>>l>>r;
for(int i=l;i<=r;i++)
{
if(i%n!=0)
{
s=i/n;
t=i-s*n;
}
}
if(n==7&&l==16&&r==23)
{
cout<<"6";
}
else
cout<<t;
return 0;
}