// const testCase = require("fs").readFileSync("/dev/stdin").toString().trim().split(" ");
// const testCase = "2 1 5".toString().trim().split(" ");
// const testCase = "5 1 6".toString().trim().split(" ");
const testCase = "100 99 1000000000".toString().trim().split(" ");
function snailWantsToClimb(testCase) {
let dayTime = testCase[0];
let nightTime = testCase[1];
let height = testCase[2];
let answer = Math.ceil((height - nightTime) / (dayTime - nightTime));
console.log(answer);
}
snailWantsToClimb(testCase);