#include<bits/stdc++.h> using namespace std; int L,R,n; int main() { scanf("%d%d%d",&n,&L,&R); int x1,x2,x3; x1=L/n; x2=(x1+1)*n; if(x2<=R) cout<<n-1; if(x2>R) { x3=max(L%n,R%n); cout<<x3; } return 0; }