暴力题解

#include<bits/stdc++.h>
#define int long long
using namespace std;
int p[500] = {1,2,4,6,12,24,36,48,60,120,180,240,360,720,840,1260,1680,2520,5040,7560,10080,15120,20160,25200,27720,45360,50400,55440,83160,110880,166320,221760,277200,332640,498960,554400,665280,720720,1081080,1441440,2162160,2882880,3603600,4324320,6486480,7207200,8648640,10810800,14414400,17297280,21621600,32432400,36756720,43243200,61261200,73513440,110270160,122522400,147026880,183783600,245044800,294053760,367567200,551350800,698377680,735134400,1102701600,1396755360,2001000000};
signed main(){
    int n; cin >> n;
    int ans;
    for(int i = 0;;i++){
        if(p[i] > n){
            cout << p[i - 1];
            return 0;
        }
    }
}