#include <iostream>
using namespace std;
int main() {
int P=0, b;
while (1){ //1 всегда истинна
cin>>b;
if (b<0) continue;
if (b==0) break; //если введен 0, выходим из цикла
P+=b;
}
cout<<"P="<<P<<endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CiBpbnQgUD0wLCBiOwoJd2hpbGUgKDEpeyAvLzEg0LLRgdC10LPQtNCwINC40YHRgtC40L3QvdCwCgkJY2luPj5iOwoJCWlmIChiPDApIGNvbnRpbnVlOwoJCWlmIChiPT0wKSBicmVhazsgLy/QtdGB0LvQuCDQstCy0LXQtNC10L0gMCwg0LLRi9GF0L7QtNC40Lwg0LjQtyDRhtC40LrQu9CwCgkJUCs9YjsKCX0KCWNvdXQ8PCJQPSI8PFA8PGVuZGw7CglyZXR1cm4gMDsKfQ==