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You are given a single integer N. It's very large, so it's given as a product of several prime powers: N = p1k1 p2k2 ... pmkm.
Let's define φ(N) as Euler's totient function -- the number of positive integers less than or equal to N that are relatively prime to N.
Let N1 = φ(N). Let N2 = φ(N1). Further, let NX = φ(NX-1) for X > 2.
Your task is to find the smallest positive integer X such that NX = 1. Only careful calculation might help... or will it be enough?
The first line of the input file contains one integer T -- the number of test cases (no more than 10). Each test case is described by a line containing one positive integer m followed by m lines, each containing two integers pi and ki (1 < pi < 100000, 1 ≤ ki ≤ 109) separated by a single space. It's guaranteed that all pi are pairwise distinct prime numbers in each test case (note that the upper limit on m can be determined from this constraint).
For each test case output just one line containing the required smallest positive integer X.
Input: 1 2 2 2 3 1 Output: 3 Explanation:
In the example test case N = 22*31 = 12. Then N1 = 4, N2 = 2 and NX = 1 for X ≥ 3, so the answer is 3.
|Tags||cook19, gennady.korotkevich, medium|
|Time Limit:||0.392183 sec|
|Source Limit:||50000 Bytes|
|Languages:||C, CPP14, JAVA, PYTH, PYTH 3.6, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, PYP3, CLOJ, FS|
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