N=int(input())
b=0
bi = 0
c=0
d=0
e=[]
f=[]
k=[]
for i in range(N):
    a=int(input())
    e.append(a)
    if(b<=a):
        b=a
        bi=i
for i in range(len(e)):
    f.append(e[i])
    if (i==bi):
        break
for i in reversed(range(len(e))):
    k.append(e[i])
    if (i==bi):
        break
b=0
for i in range(len(f)):
    if(f[i]<b):
        c=c+1
    else:
        b=f[i]
        if(c>d):
            d=c
            c=0
        else:
            c=0
b=0
for i in range(len(k)):
    if(k[i]<b):
        c=c+1
    else:
        b=k[i]
        if(c>d):
            d=c
            c=0
        else:
            c=0
if(d==0):
   print("-1")
else:
    print(d+1)