'use strict';

const lines = require('fs').readFileSync('/dev/stdin', 'utf8').trim().split('\n');
const N = Number(lines[0]);
const A = lines[1].split(' ').map(Number);

let indices = [];
for (let i = 0; i < N; i++) {
	indices[indices.length] = i;
}

indices = indices.sort((a, b) => A[a] - A[b]);

let sum = 0;

function main(left, right, index) {
	if (left > right) return;
	
	let i = index;
	while (indices[i] < left || indices[i] > right) i++;
	
	sum += A[indices[i]] * (indices[i] - left + 1) * (right - indices[i] + 1);
	main(left, indices[i] - 1, i + 1);
	main(indices[i] + 1, right, i + 1);
}

main(0, N - 1, 0);

console.log(sum);