50. bash, 10251024 bytes
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###|
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__DATA__=1#"'x"//
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###;console.log 39
""""#//
=begin //
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#define z sizeof'c'-1?"38":"37"
#include<stdio.h>
main( )/*/
#()`#`\'*/{puts(z );}/*'``
<>{# }//
#}
disp 49#//
#{
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=end #//
"""#"#//
#}
#|o51~nJ;#:p'34'\
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VIP score (Versatile Integer Printer): .008200 (to improve, next entry should be no more than 1087 bytes)
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Pyth and 05AB1E
Pyth and 05AB1E
Prelude
Prelude
Incident
Incident
50 languages in a kilobyte of code
It was pointed out by @MistahFiggins that my 1025-byte submission would be way neater if it were 1024 bytes (especially as the fiftieth language is a milestone in its own right). This required finding a byte of savings somewhere. In this case, I saved three bytes in the Deadfish~, at the costs of two extra bytes used to make Incident tokens line up correctly, and thus bringing the program down to 1024 bytes exactly.
Previously, the formula that the Deadfish~ code used was (2²+2)²+10×1+2 = 48. The new formula is (3²-2)²-1, also producing 48. Surprisingly, it isn't that much shorter to write in Deadfish~, despite being considerably simpler.
This also gives us a (VIP score) of .008192. Not only is this a new record, it's also a nicely round number in its own right (which is, obviously, a consequence of having nice round numbers as the inputs to the formula).