#include <iostream>
using namespace std;
int main(){
    int prev, now, next, counter = 2, maxcounter = 0;
    cin >> prev;
    cin >> now;
    cin >> next;
    int prevcounter = 0, nowcounter = 0, minlength = 0, nowlength = 0;
    while(next > 0){
        if(prev < now && now > next){
            maxcounter++;
            if(prevcounter == 0){
                prevcounter = counter;
            } else {
                nowcounter = counter;
                nowlength = nowcounter - prevcounter;
                prevcounter = nowcounter;
                if(nowlength <= minlength || minlength == 0){
                    minlength = nowlength;
                }
            }
        }
        cout << counter << " " << prev << " " << now << " " << next << " " <<
        maxcounter << " " << prevcounter << " " << nowcounter << " " <<
        minlength << " " << nowlength << endl;
        prev = now;
        now = next;
        cin >> next;
        counter++;
    }
    cout << minlength;
    return 0;
}