#include <stdio.h>
#include <string.h>

int n;

int main() {
    while (~scanf("%d", &n)) {
    int ans = 1;
    int now = 1;
    while (now) {
        now = (now * 10 + 1) % n;
        ans++;
    }
    printf("%d\n", ans);
    }
    return
 
 0;
}

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