/*#include <stdio.h>int main (){ int a,b,c,i,j = 0,k = 0; for(i=0; i<4; i++){ scanf("%d %d",&c,&b); j = j - c; j = j + b; if(k<j){ k = j; } }printf("%d",k);}#include <stdio.h>int main (){ int n,k,a,s =1,i,j = 0; scanf("%d %d",&n,&k); for(i = 0;i<k;i++){ s*=n; } printf("%d",s);} */ //4621 : 약수 구하기