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program main
    implicit none
    integer :: n,i
    real(8) ::pi,u1,u2,r   
   pi=3.1415926535
    call random_seed ()
    n=1000      
   do i=1,n
    call random_number(u1)
    call random_number(u2)
    r=sqrt(-log(u1))*cos(2*pi*u2)  
    print *,r
    enddo
    end
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