# Original solution
from bisect import*
class BTreeNode:
    def __init__(self):self.key,self.child=[],[]
class BTree:
    def __init__(self):self.root=BTreeNode()
    def search_higher(self,key):
        ptr=self.root
        ret=None
        while ptr.child:
            i=bisect(ptr.key,key)
            if i!=len(ptr.key):ret=ptr.key[i]
            ptr=ptr.child[i]
        i=bisect(ptr.key,key)
        if i!=len(ptr.key):ret=ptr.key[i]
        return ret
    def search_lower(self,key):
        ptr=self.root
        ret=None
        while ptr.child:
            i=bisect_left(ptr.key,key)
            if i:ret=ptr.key[i-1]
            ptr=ptr.child[i]
        i=bisect_left(ptr.key,key)
        if i:ret=ptr.key[i-1]
        return ret
    def insert(self,key):
        def insert_rec(ptr):
            b_size=256
            if not ptr.child:
                insort(ptr.key,key)
                if len(ptr.key)==b_size*2-1:
                    ret=BTreeNode()
                    ret.key=ptr.key[:b_size]
                    ptr.key=ptr.key[b_size:]
                    return ret
            else:
                i=bisect(ptr.key,key)
                tmp=insert_rec(ptr.child[i])
                if tmp:
                    ptr.key.insert(i,tmp.key.pop())
                    ptr.child.insert(i,tmp)
                    if len(ptr.child)==b_size*2:
                        ret=BTreeNode()
                        ret.child=ptr.child[:b_size]
                        ptr.child=ptr.child[b_size:]
                        ret.key=ptr.key[:b_size]
                        ptr.key=ptr.key[b_size:]
                        return ret
        tmp=insert_rec(self.root)
        if tmp:
            root=BTreeNode()
            root.key=[tmp.key.pop()]
            root.child=[tmp,self.root]
            self.root=root
def main():
    n,*a=list(map(int,open(0).read().split()))
    l=[0]*n
    for i,v in enumerate(a,1):l[v-1]=i
    t=BTree()
    insert,search_higher,search_lower=t.insert,t.search_higher,t.search_lower
    insert(0)
    insert(n+1)
    c=0
    for i,v in enumerate(l,1):
        c+=(search_higher(v)-v)*(v-search_lower(v))*i
        insert(v)
    print(c)
main()

# Optimized solution
from bisect import*
class SqrtSet:
    def __init__(self,block_limit=201):
        self.key=[]
        self.child=[[]]
        self.block_limit=block_limit
    def search_lower(self,key):
        if not key:return None
        ret=None
        i=bisect_left(self.key,key)
        if i:ret=self.key[i-1]
        block=self.child[i]
        i=bisect_left(block,key)
        if i:ret=block[i-1]
        return ret
    def search_higher(self,key):
        if not key:return None
        ret=None
        i=bisect(self.key,key)
        if i<len(self.key):ret=self.key[i]
        block=self.child[i]
        i=bisect(block,key)
        if i<len(block):ret=block[i]
        return ret
    def insert(self,key):
        i=bisect(self.key,key)
        block=self.child[i]
        insort(block,key)
        if len(block)==self.block_limit:
            sep=self.block_limit//2
            self.key.insert(i,block[sep])
            self.child.insert(i+1,block[sep+1:])
            self.child[i]=block[:sep]
def main():
    n,*a=list(map(int,open(0).read().split()))
    l=[0]*n
    for i,v in enumerate(a,1):l[v-1]=i
    t=SqrtSet()
    t.insert(0)
    t.insert(n+1)
    c=0
    for i,v in enumerate(l,1):
        c+=(t.search_higher(v)-v)*(v-t.search_lower(v))*i
        t.insert(v)
    print(c)
main()