let count = 0
let c = month
while((c-2)>0){
c--
count++
count = count+born(c-1)
}
return count
}
let month = parseInt(readline())
console.log(born(month)+1)
let count = 0
let c = month
while((c-2)>0){
c--
count++
count = count+born(c-1)
}
return count
}
let month = parseInt(readline())
console.log(born(month)+1)