#include<bits/stdc++.h> using namespace std; //int a; //int n,a,b,sum=0; //int n; //double a,b,sum,c; //int n,a,sum; //double n; //int n; int main(){ /**cin>>a; int jsum=0; int osum=0; for(int i=1;i<=a;i++){ if(i%2==0) osum+=i; else jsum+=i; } cout<<jsum<<" "<<osum; /**cin>>n; for(int i=2;i<=n;i++){ if(i%2==0) sum+=i; else sum-=i; } cout<<sum+1; 3.30作业: cin>>n; for(int i=2;i<=(n-1);i++){ if(n%i!=0) { cout<<"No"; return 0; } } cout<<"Yes"; } return 0; /a=100; c=100; b=0; for(int i=1;i<=10;i++){ a/=2; sum=a; } for(int i=1;i<=11;i++){ c/=2; b+=c; } printf("%.6f",b); cout<<endl; printf("%.6f",a); } cin>>n>>a; for(int i=n;i<=a;i++){ if(i%13==0) sum+=i; } cout<<sum; cin>>n; for(int i=1;i<20;i++){ n*=1.2; } cout<<n; cin>>n; for(int i=1;i<=19;i++){ n*=1.2; } cout<<round(n);**/ /*cin>>n; int c=0,d=0; int a=10000,b=10000; for(int i=1;i<=n;i++){ if(i%2==0){ c= b=b-2; d= a-=1; } e=i; } if() int s=0,a=1; while(s<=1000){ s+=a; a+=1; } cout<<a-1; int n,cnt=0; cin>>n; while(n!=0){ cnt+=n%10; n/=10; } cout<<cnt; int a=0,b=0,sum=0; for(int i=1;i<=1000;i++){ a++; if(a>20) a=1; b++; if(b>30) b=1; if(a==b) sum++; } cout<<sum; int a,b; cin>>a; int c=10; int sum=0; while(a!=0){ b=a%c; sum=sum*10+b; a=a/10; } cout<<sum; int g,s,b; for(int i=100;i<=999;i++){ g=i%10; s=i%100/10; b=i/100; if(g*g*g+s*s*s+b*b*b==i) cout<<i<<" "; }**/ int n,a=1; cin>>n; int b; for(int i=1;i<=n-1;i++){ a+=1; a*=2; } cout<<a; }