const fs = require('fs');
const input = fs.readFileSync('/dev/stdin').toString().split(' ');
let a = parseInt(input[0]);
let b = parseInt(input[1]);
let c = parseInt(input[2]);
let result=0;
if(b>=c){
result=-1;
}else{
result=Math.floor(a/(c-b))+1;
}
console.log(result);
๐ ์ฒ์์ ์๋ ์ฝ๋์ ๊ฐ์ด ๋ฐ๋ณต๋ฌธ์ ์จ์ฃผ์๋๋ฐ 'ํ๋ ธ์ต๋๋ค'๋ผ๊ณ ๋์๋ค.
์ฐพ์๋ณด๋ ๋ฐ๋ณต๋ฌธ์ ์ฌ์ฉํ๋ฉด ์๋๋ ๋ฏ ํ๋ค.
const fs = require('fs');
const input = fs.readFileSync('/dev/stdin').toString().split(' ');
let a = parseInt(input[0]);
let b = parseInt(input[1]);
let c = parseInt(input[2]);
let count=0;
let result=0;
if(b>=c){
result=-1;
}else{
while(a+b*count>=c*count){
count++;
}
result=count;
}
console.log(result);