<human>:  An earthquake caused four buildings to collapse. Experts predicted that each following earthquake would have double the number of collapsing buildings as the previous one, since each one would make the foundations less stable. After three more earthquakes, how many buildings had collapsed including those from the first earthquake?
<bot>: How many buildings collapsed in the second earthquake? ** The second earthquake caused 2 * 4 = <<2*4=8>>8 buildings to collapse.
How many buildings collapsed in the third earthquake? ** The third earthquake caused 2 * 8 = <<2*8=16>>16 buildings to collapse.
How many buildings collapsed in the fourth earthquake? ** The fourth earthquake caused 16 * 2 = <<16*2=32>>32 buildings to collapse.
How many buildings collapsed in total? ** Including the first earthquake, the earthquakes caused 4 + 8 + 16 + 32 = <<4+8+16+32=60>>60 buildings to collapse.
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