View Code of Problem 31

#include<stdio.h>
#define N 65536
int main()
{
	int k;
	while(scanf("%d",&k)!=EOF)
	{
		int n=0;
		int i=0;
		while(n<k)
		{
			i++;
			if((i*21+2)%5==3)
				n++;
				
		}
		printf("%d\n",i*21+2);
	}
	
	return 0;
	
}