process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function solve(A) {
    //  Return the sum of S(S(A)) modulo 10^9+7.
    S(A, A.length);
    return S(A, A.length);
}

function S(A, len) {
	var sum = A[0];
	
	for (var i = 1; i < len; i++) {
		for (var j = i; j >= 1; j--) {
			var j2 = j - 1;
			var i2 = i - 1;
			
			var dest = j*len-(j*(j+1)/2) + i;
			var compare = j2*len-(j2*(j2+1)/2) + i2;
			
			var max = Math.max(A[i], A[compare]);
			sum += max;
			
			A[dest] = max;
		}
		sum += A[i];
	}
	
	return sum % (1000000000 + 7);
}

function main() {
    var n = parseInt(readLine());
    a = readLine().split(' ');
    a = a.map(Number);
    var result = solve(a);
    process.stdout.write("" + result + "\n");

}