a1, a2, a3,..., an are natural numbers satisfying 0<a1<a2<a3...<an, and (13/14)=\frac{1}{a_{1}}+\frac{1}{a_ {2}}+\frac{1}{a_{3}}+…+\frac{1}{a_{n}}, then what is the minimum value of n.
a1，a2，a3，…，an是满足0＜a1＜a2＜a3…＜an的自然数，且(13/14)=\frac{1}{a_{1}}+\frac{1}{a_{2}}+\frac{1}{a_{3}}+…+\frac{1}{a_{n}}，那么n的最小值是多少．
<result>4</result>