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package main
import (
"fmt"
"math"
"os"
)
func calc(n int) int {
acc := 0
s := math.Sqrt(float64(n))
if s == math.Trunc(s) {
acc += int(s)
} else {
s = math.Ceil(s)
}
for i := 1; i < int(s); i++ {
if n % i == 0 {
/* START PART 2 */
ndi := n / i
if ndi <= 50 {
acc += i + ndi
} else if i <= 50 {
acc += ndi
}
/* END PART 2 START PART 1 */
acc += i + n / i
/* END PART 1 */
}
}
return acc
}
func main() {
file, err := os.Open("input")
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
os.Exit(1)
}
var n int
fmt.Fscanf(file, "%d", &n)
/* START PART 2 */
sn := n / 11
/* END PART 2 START PART 1 */
sn := n / 10
/* END PART 1 */
for i := 1; i <= n; i++ {
if calc(i) >= sn {
fmt.Println(i)
break
}
}
}
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