为什么输出是科学计数法啊

#include<bits/stdc++.h>
#define ll long long
using namespace std;
const ll N=1e5+5; 
ll n,a[N],d,v[N],zuixiaoa,ans,shenyu;
int main()
{
	zuixiaoa=0x3ff;
	ans=0;
	shenyu=0;
	cin>>n>>d;
	for(ll i=1;i<n;i++)
	{
		cin>>v[i];
	}
	for(ll i=1;i<=n;i++)
	{
		cin>>a[i];
		zuixiaoa=min(zuixiaoa,a[i]);
	}
	ll z=0;
	for(ll i=1;i<n;i++)
	{
		z+=v[i];
	}
	if(zuixiaoa==a[1])
	{
		cout<<floor(z/d)*a[1];
		return 0; 
	}
	for(ll i=1;i<n;i++)
	{
		ll p=v[i]-shenyu;
		ll dd=p/d;
		if(dd*d<p)
		dd++;
		ans+=a[i]*dd;
		shenyu=dd*d-p;
	    if(a[i]<a[i+1])
		{
			swap(a[i],a[i+1]);
		}
	}
	cout<<ans;
	return 0;
}