import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.io.BufferedReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CSumOfProductOfPairs solver = new CSumOfProductOfPairs();
        solver.solve(1, in, out);
        out.close();
    }

    static class CSumOfProductOfPairs {
        NumberTheory.Mod107 mod = new NumberTheory.Mod107();

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            long[] a = in.readLongArray(n);

            long sum = 0;
            long sum2 = 0;
            for (long x : a) {
                sum = mod.add(sum, x);
                sum2 = mod.add(sum2, mod.pow(x, 2));
            }

            long answer = mod.div(mod.subtract(mod.pow(sum, 2), sum2), 2);

            out.println(answer);
        }

    }

    static class IntStack {
        int[] array;
        int size = 0;

        public IntStack() {
            this(8);
        }

        public IntStack(int capacity) {
            array = new int[capacity];
        }

        public void push(int item) {
            if (size >= array.length)
                array = resize(array);
            array[size++] = item;
        }

        private static int[] resize(int[] array) {
            int[] newArray = new int[array.length << 1];
            System.arraycopy(array, 0, newArray, 0, array.length);
            return newArray;
        }

        public String toString() {
            int[] trimmed = new int[size];
            System.arraycopy(array, 0, trimmed, 0, size);
            return Arrays.toString(trimmed);
        }

    }

    static class InputReader {
        public final BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

        public long[] readLongArray(int n) {
            long[] x = new long[n];
            for (int i = 0; i < n; i++) {
                x[i] = nextLong();
            }
            return x;
        }

    }

    static class NumberTheory {
        private static void ASSERT(boolean assertion) {
            if (!assertion)
                throw new AssertionError();
        }

        public abstract static class Modulus<M extends NumberTheory.Modulus<M>> {
            final IntStack factorial = new IntStack();
            final IntStack invFactorial = new IntStack();

            public abstract long modulus();

            public Modulus() {
                super();
                factorial.push(1);
                invFactorial.push(1);
            }

            public long normalize(long x) {
                x %= modulus();
                if (x < 0)
                    x += modulus();
                return x;
            }

            public long add(long a, long b) {
                long v = a + b;
                return v < modulus() ? v : v - modulus();
            }

            public long subtract(long a, long b) {
                long v = a - b;
                return v < 0 ? v + modulus() : v;
            }

            public long mult(long a, long b) {
                return (a * b) % modulus();
            }

            public long div(long a, long b) {
                return mult(a, inv(b));
            }

            public long pow(long x, int e) {
                if (e < 0) {
                    x = inv(x);
                    e *= -1;
                }
                if (e == 0)
                    return 1;
                if ((e & 1) > 0)
                    return mult(x, pow(x, e - 1));
                return pow(mult(x, x), e / 2);
            }

            public long inv(long value) {
                long g = modulus(), x = 0, y = 1;
                for (long r = value; r != 0; ) {
                    long q = g / r;
                    g %= r;

                    long temp = g;
                    g = r;
                    r = temp;

                    x -= q * y;

                    temp = x;
                    x = y;
                    y = temp;
                }

                ASSERT(g == 1);
                ASSERT(y == modulus() || y == -modulus());

                return normalize(x);
            }

        }

        public static class Mod107 extends NumberTheory.Modulus<NumberTheory.Mod107> {
            public long modulus() {
                return 1_000_000_007L;
            }

        }

    }
}



Measured memory_bytes: 55768