tle求条

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
ll n,a,s;
int r()
{
    ll f=1,k=0;
    char c=getchar();
    while(c<'0'||c>'9')
    {
        if(c=='-')f=-1;
        c=getchar();
    }

    while(c>='0'&&c<='9')
    {
        k=k*10+c-'0';
        c=getchar();
    }
    return k*f;
}
void w(ll x)
{
    if(x<0)putchar('-'),x=-x;
    if(x<10)putchar(x+'0');
    else w(x/10),putchar(x%10+'0');
}
int main()
{
    // ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    n=r();
    while(n--)
    {
        
        a=r();
        s+=a;
    }
    w(s);
}