View Code of Problem 73

#include <stdio.h>
int main(void)
{
	int n,i,sum;
	while(scanf("%d",&n)!=EOF)
	{
		sum=1;
		for(i=1; i<n; i++)
		{
			sum = (sum+1)*2;
		}
		printf("%d\n",sum);
	}
 	return 0;
}

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