#include
#define int long long
using namespace std;
const int maxn=1e6+10;
int n,m,opr,x,y,k;
int c[maxn],a[maxn];
inline int read()
{
    int ans=0;
    char last=' ',ch=getchar();
    while(ch<'0'||ch>'9') last=ch,ch=getchar();
    while(ch>='0'&&ch<='9') ans=ans*10+ch-'0',ch=getchar();
    if(last=='-') ans=-ans;
    return ans;
}
int lowbit(int x)
{
    return x&-x;
}
void updata(int x,int v)
{
    while(x<=n)
    {
        c[x]+=v;
        x+=lowbit(x);
    }
}
int sum(int x)
{
    int ans=0;
    while(x>0)
    {
        ans+=c[x];
        x-=lowbit(x);
    }
    return ans;
}
signed main()
{
    n=read();m=read();
    for(int i=1;i<=n;i++)
    {
        a[i]=read();
        updata(i,a[i]-a[i-1]);
    }
    for(int i=1;i<=m;i++)
    {
        opr=read();
        if(opr==1)
        {
            x=read();y=read();k=read();
            updata(x,k);
            updata(y+1,-k);
        } 
        if(opr==2)
        {
            x=read();
            printf("%lld\n",sum(x));
        } 
    }
    return 0;
}