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#include <bits/stdc++.h>
using namespace std;
int i, j, n, K, cnt, a[1000];
int main() {
for (i = 6; i < 10000; i++) {
n = i;
cnt = 0;
for (j = 1; j <= 5; j++)
if (n % 5 == 1 && n / 5 > 0) {
n = n - n / 5 - 1;
cnt++;
}
if (cnt == 5) {
a[k] = i;
k++;
}
}
printf("%d\n", a[0]);
return 0;
}