#include "algorithm" #include "iostream" #define int long long using namespace std; int s[1000000]; signed main(){ int n,l,r; cin>>n>>l>>r; int j=0; for(int i=l;i<=r;i++){ s[j]=i%n; j++; } sort(s+1,s+j+1); cout<<s[j]; return 0; }