#include #include //stdio.h using namespace std; double a,b,c; int main() { cin>>a>>b>>c; if(a>0 and b>0 and c>0 and a+b>c and a+c>b and b+c>a){ if(aa+bbcc or aa+c*cbb or bb+cc==aa) cout<<"Yes!"; else{ cout<<"No!"; } }else{ cout<<"Error!"; } return 0; }