include<bits/stdc++.h>

using namespace std; int main(){

int n,L,R,a,b;
scanf("%d%d%d",&n,&L,&R);
b = n - 1;
if(R < n){
a = R;
printf("%d",a%n);
return 0;
}
if(R >= n && L < n){
	a = n - 1;
}
if(L > n){
	while(b < L){
		b += n; 
	}
	if(b > R){
		a = R%n;
    }
	else if(b <= R){
		a = n - 1;
	}
	}		
printf("%d",a);

}