Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
1
0
5
b
i
l
l
i
o
n
5
.
7
m
i
l
l
i
o
n
2
0
6
.
4
9
2
b
i
l
l
i
o
n
2
0
4
1
b
i
l
l
i
o
n
Math Input
Natural Language
Math Input