You have a rectangular board of size $n\times m$ ($n$ rows, $m$ columns). The $n$ rows are numbered from $1$ to $n$ from top to bottom, and the $m$ columns are numbered from $1$ to $m$ from left to right.

The cell at the intersection of row $i$ and column $j$ contains the number $i^j$ ($i$ raised to the power of $j$). For example, if $n=3$ and $m=3$ the board is as follows:

Find the number of distinct integers written on the board.

Input

The only line contains two integers $n$ and $m$ ($1\le n,m\le 10^6$) — the number of rows and columns of the board.

Output

Print one integer, the number of distinct integers on the board.

见题面 Input 部分

见题面 Output 部分

The statement shows the board for the first test case. In this case there are $7$ distinct integers: $1$, $2$, $3$, $4$, $8$, $9$, and $27$.

In the second test case, the board is as follows:

There are $5$ distinct numbers: $1$, $2$, $4$, $8$ and $16$.

In the third test case, the board is as follows:

There are $6$ distinct numbers: $1$, $2$, $3$, $4$, $9$ and $16$.