def main():
    import sys
    input = sys.stdin.readline
    
    N = int(input())
    P = list(map(int,input().split()))
    count = 0
    for i in range(N):
        if P[i] != N:
            count += i + 1
        else:
            count -= i + 1
    print(count)

if __name__ == '__main__':
    main()