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#include <cstdio>
using namespace std;
int ack(int m,int n){
    if(m==0)return n+1;
    else if(n==0)return ack(m-1,1);
    else return ack(m-1,ack(m,n-1));
}
int main(){
    printf("%d\n",ack(3,4));
    putchar('\n');
    return 0;
}