538 B | 538 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
l = mii()
k = "infinity"
for i in range(1, n):
if l[i] <= l[0]:
k = i
break
print(k)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()