#include <cstdio>
#define getchar() (p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, 1 << 21, stdin), p1 == p2) ? EOF : *p1++)
using namespace std;
char buf[1 << 21], *p1 = buf, *p2 = buf, obuf[1 << 21], *O = obuf;

inline int read() {
    int x = 0;
    char ch = getchar();
    bool flag = true;
    while (ch < '0' || ch > '9') {
        if (ch == '-') {
            flag = false;
        }
        ch = getchar();
    }
    while (ch >= '0' && ch <= '9') {
        x = (x << 1) + (x << 3) + (ch ^ 48);
        ch = getchar();
    }
    return flag ? x : ~(x - 1);
}

const int N = 100005;
long long sum[N], sum2[N], s[N];
int n, m;

inline void change(int x, int y) {
    long long p = x;
    while (x <= n) {
        sum[x] += y;
        sum2[x] += p * y;
        x += x & -x;
    }
}

inline long long ask(int x) {
    long long ans = 0;
    int p = x;
    while (x) {
        ans += (p + 1) * sum[x] - sum2[x];
        x -= x & -x;
    }
    return ans;
}

int main() {
    n = read();
    m = read();
    for (register int i = 1; i <= n; i++) {
        s[i] = read() + s[i - 1];
    }
    while (m--) {
        int flag = read(), x = read(), y = read(), k;
        if (flag == 1) {
            k = read();
            change(x, k);
            change(y + 1, -k);
        } else {
            printf("%lld\n", ask(y) - ask(x - 1) + s[y] - s[x - 1]);
        }
    }
    return 0;
}