#include <bits/stdc++.h> 
using namespace std;
typedef long long LL;
const LL N=1e6+10;
LL n,a[N],c[N];
void add(LL x,LL k){for(;x<=n;x+=x&-x)c[x]+=k;}
LL getsum(LL x)
{
    LL res=0;
    for(;x>=1;x-=x&-x)res+=c[x];
    return res;
}
int main()
{
    LL m;scanf("%lld%lld",&n,&m);
    memset(c,0,sizeof(c));
	a[0]=0;for(LL i=1;i<=n;i++)scanf("%lld",&a[i]),add(i,a[i]-a[i-1]);
    for(LL i=1,op,x,y,d;i<=m;i++)
    {
        scanf("%lld",&op);
        if(op==1)
		{
			scanf("%lld%lld%lld",&x,&y,&d);
			add(x,d);add(y+1,-d);
		}
        else
        {
            scanf("%lld",&x);
            printf("%lld\n",getsum(x));
        }
    }
    return 0;
}