View Code of Problem 73

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
    int i,y=1,n;
    scanf("%d",&n);
    for(i=1;i<n;i++){
    	y=(y+1)*2;
	}
    printf("%d\n",y);
	return 0;
}