kSymbol

package main
import "fmt"
func pow10(a, b int64) int64 {
    ch := a
    var p int64
    p = 1
    for ; b > 0 ; {
        if b & 1 != 0 {
            p *= ch
        }
        ch *= ch
        b >>= 1
    }
    return p
}
func main() {
var (
    x int64
    pa int64
    now int64
)
fmt.Scanf("%d", &x)
pa = 1
for ; x - pa * 9 * pow10(10, (pa - 1)) >= 0 ; {
    x -= pa * 9 * pow10(10, (pa - 1))
    pa += 1
}
now = pow10(10, (pa - 1)) + (x/pa)
var i int64
for i = 0; i < (pa - 1 - (x % pa)); i++ {
    now = (now / 10)
}
now %= 10
fmt.Print(now)
}