#include<iostream> using namespace std; int main(){ int a; cin>>a; if(a>=1&&a<2){ cout<<"31"; } else if(a>=2&&a<3){ cout<<"29"; } else if(a>=3&&a<4){ cout<<"31"; } else if(a>=4&&a<5){ cout<<"30"; } else if(a>=5&&a<6){ cout<<"31"; } else if(a>=6&&a<7){ cout<<"31"; } else if(a>=8&&a<9){ cout<<"31"; } else if(a>=9&&a<10){ cout<<"30"; } else if(a>=10&&a<11){ cout<<"31"; } else if(a>=11&&a<12){ cout<<"30"; } else if(a>=12&&a<13){ cout<<"31"; } else{ cout<<"Invalid."<<endl; } }