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#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 #include 
using namespace std;
int cnt[6666];
int cnt_after_zero[6666];
int main() {
    ios_base::sync_with_stdio(false);
    int num;
    bool first_zero = false;
    memset(cnt_after_zero, 0, sizeof cnt_after_zero);
    while(true) {
        cin >> num;
        if(num == 11111) {
            break;
        }
        if(first_zero and num != 0) {
            cnt[num]++;
            cnt_after_zero[num]++;
        }
        if(num == 0) {
            first_zero = true;
            memset(cnt_after_zero, 0, sizeof cnt_after_zero);
        }
    }
    int b1 = -2e9, s1 = 2e9;
    for(int i = 600; i <= 6000; i++) {
        cnt[i] -= cnt_after_zero[i];
        if(cnt[i] > 0) {
            b1 = max(b1, i);
            s1 = min(s1, i);
        }
    }
    cout << b1 - s1 << endl;
     
    return 0;
}