De facto speed

#include<stdio.h>
typedef long long int ll;

int main()
{
    int n;
    scanf("%d",&n);
    ll arr[n+1];
    for(int i=1;i<=n;i++){
        scanf("%lld",&arr[i]);
    }
    ll ans = arr[n];
    for(int i=n - 1;i>=1;i--){
        if((arr[i] < ans && ans % arr[i] != 0) || arr[i] > ans)ans = ((ans/arr[i]) + 1) * arr[i];
    }
    printf("%lld",ans);
    return 0;
}