Write a function that takes an argument $n$ and returns the sum of integers from $1$ to $n.$ For example, if $n=5,$ your function should add up $1+2+3+4+5$ and return $15.$ If $n$ is less than $1,$ just return $0.$ Use a while loop to calculate this sum.

def sum$\_$of$\_$integers $(n)$ :

if $n<mn\; id="EditorElement\_3695813">1</mn>$ :

return $0$

$i=1$

sum $=$

while :

sum $=$ sum $+i$

$i=$

return sum

print$($sum$\_$of$\_$integers$(3))$ # should print $6$

print$($sum$\_$of$\_$integers$(4))$ # should print $10$

print$($sum$\_$of$\_$integers$(5))$ # should print $15$

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