process.stdin.resume();
process.stdin.setEncoding('utf8');
// your code goes here
var target=75, neuNum = 2, detNum = 1, proNum=3;
var preProsToTarget = neuNum*(target/(100-target))+detNum*(100+target)/(100-target);
var prosToTarget = preProsToTarget-proNum;
console.log(prosToTarget);
cHJvY2Vzcy5zdGRpbi5yZXN1bWUoKTsKcHJvY2Vzcy5zdGRpbi5zZXRFbmNvZGluZygndXRmOCcpOwoKLy8geW91ciBjb2RlIGdvZXMgaGVyZQp2YXIgdGFyZ2V0PTc1LCBuZXVOdW0gPSAyLCBkZXROdW0gPSAxLCBwcm9OdW09MzsKdmFyIHByZVByb3NUb1RhcmdldCA9IG5ldU51bSoodGFyZ2V0LygxMDAtdGFyZ2V0KSkrZGV0TnVtKigxMDArdGFyZ2V0KS8oMTAwLXRhcmdldCk7CnZhciBwcm9zVG9UYXJnZXQgPSBwcmVQcm9zVG9UYXJnZXQtcHJvTnVtOwpjb25zb2xlLmxvZyhwcm9zVG9UYXJnZXQpOw==