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program rsa
implicit none
integer :: n, m
print *, "Enter numbers to compute gcd:"
read(*,*) n, m
print *, "gcd: ", gcd(n,m)
contains
recursive function gcd(n,m) result(x)
implicit none
integer, intent(in) :: n,m
integer :: x
if (n == 0) then
x = m
else if (m == 0) then
x = n
else
x = gcd(m, mod(n,m))
end if
end function gcd
end program rsa
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