#include <cstdio>
int a[] = {
    1,          2,         4,         6,         12,        24,
    36,         48,        60,        120,       180,       240,
    360,        720,       840,       1260,      1680,      2520,
    5040,       7560,      10080,     15120,     20160,     25200,
    27720,      45360,     50400,     55440,     83160,     110880,
    166320,     221760,    277200,    332640,    498960,    554400,
    665280,     720720,    1081080,   1441440,   2162160,   2882880,
    3603600,    4324320,   6486480,   7207200,   8648640,   10810800,
    14414400,   17297280,  21621600,  32432400,  36756720,  43243200,
    61261200,   73513440,  110270160, 122522400, 147026880, 183783600,
    245044800,  294053760, 367567200, 551350800, 698377680, 735134400,
    1102701600, 1396755360 };
int main()
{
    int x;
    scanf("%d", &x);
    for (int i = 67; i >= 0; i--)
        if (a[i] <= x)
        {
            printf("%d", a[i]);
            break;
        }
    return 0;
}